CVE-2026-14564

Executive Summary

CVE-2026-14564 is a critical-severity vulnerability (CVSS 9.0) in Logsign SIEM versions 6.4.97 through 6.4.113, caused by insufficiently protected credentials (CWE-522). The flaw allows a remote, authenticated user with high privileges to retrieve embedded sensitive data — credential material the product stores for its own operation — directly through the management interface. Organizations running affected Logsign SIEM builds should treat the platform as breached if any administrative account is suspected compromised, and should upgrade to version 6.4.114 as the identified remediation boundary. No public PoC, exploit code, CISA KEV listing, or confirmed in-the-wild exploitation was identified in the provided data.

Technical Analysis

CWE-522 covers a class of weaknesses in which credentials and secret material are not protected with adequate strength while at rest. The NVD description for CVE-2026-14564 states that the product "allows Retrieve Embedded Sensitive Data," indicating that Logsign SIEM stores credentials embedded within its configuration or application artifacts, and that a sufficiently privileged user can retrieve those secrets through the product's own functionality without any cryptographic boundary (e.g., re-entry of a master password, hardware-backed key, or separate authorization).

By product class, a SIEM is credential-dense: it must hold secrets for each upstream telemetry source (log collectors, API-based feeds, database connectors) and for each downstream integration (LDAP/Active Directory binding, SMTP alert delivery, ticketing and notification services, archival storage). If these secrets are persisted in plaintext, weakly obfuscated form, or with statically embedded decryption keys, then any user able to access the configuration surface can recover them. The NVD record does not disclose the affected module, the storage format, or the specific retrieval routine; insufficient technical detail is available to name any file path, endpoint, or function. This report therefore analyzes the vulnerability at the class level.

The CVSS vector — CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:L — provides the meaningful attack surface characterization:

• AV:N / AC:L — the management interface is remotely reachable and the exploitation logic is trivial in complexity; no race condition, memory corruption, or advanced technique is implied.
• PR:H — a high-privileged session (administrative or equivalent) is required. This is consistent with a configuration-reading flaw: the secrets are only exposed to users who can legitimately access configuration functionality.
• S:C — the scope changes, meaning the impact crosses a trust boundary. The extracted credentials are valid beyond the Logsign platform itself, typically against the external systems the SIEM integrates with.
• C:H / I:H / A:L — full disclosure of stored secrets; recovered credentials can be used to impersonate trusted integrations, modify log and alert flows, or alter connected systems; direct availability impact is limited.

The affected version range, "from 6.4.97 before 6.4.114," scopes the exposure to those builds. The structured affected-version field in the data is empty; the NVD free-text range is authoritative. It is not possible from the available data to determine whether earlier release branches share the flaw; analysis below is strictly limited to the stated range.

Exploitation Scenarios

No public PoC, Nuclei template, or exploit code is known for this CVE. The following attack chain is inferred from the vulnerability class and the CVSS profile; it is an analytical projection, not a confirmed exploitation path.

1. Reconnaissance / target identification. An attacker discovers Internet-exposed Logsign SIEM instances by fingerprinting the web management interface (site titles, login-page banners, HTTP server headers referencing "Logsign"; see SHODAN_DORKS). Because exploitation requires high privileges (PR:H), the attacker must simultaneously acquire a qualifying account — via phishing of administrators, credential-stuffing against management accounts, or by chaining a separate authentication-bypass or default-credential weakness.

2. Triggering the flaw. Using an authenticated high-privileged session, the attacker accesses the configuration functionality of the Logsign SIEM web interface where integration and connector settings are stored and displayed. Because the stored credential material is insufficiently protected, the application returns it in a directly usable form instead of enforcing an additional secret-release control. No specific endpoint, parameter, or function name is published; triggering is described at class level as an authenticated read of embedded secret data.

3. Payload / execution method. There is no payload in the remote-code-execution sense. This is a retrieval and authorization deficiency equivalent to ATT&CK T1552.001 (Unsecured Credentials: Credentials In Files), performed remotely through the product's own features. The "request" is simply a privileged read of configuration data; the "response" contains the secret material.

4. Post-exploitation impact. The recovered credentials are valuable because of reuse. Logsign SIEM credentials typically map to the surrounding infrastructure: directory bind accounts, log-source devices, mail relays, databases, and SaaS connectors. The attacker can authenticate with the SIEM's identity against those systems — precisely the cross-boundary effect captured by S:C in the CVSS vector. Consequences include lateral movement into the corporate network, reading data the SIEM was trusted to collect, and modifying integration configurations to suppress or forge security evidence. Because SIEM platforms are frequently targeted to blind defenders before destructive operations, this flaw should be considered a significant pre-ransomware enabler where unpatched.

Impact Assessment

Business impact. Logsign SIEM is the security monitoring system of record for its install base. A credential-disclosure weakness in a SIEM degrades confidentiality of the entire monitoring environment, but the more damaging consequence is the high-integrity impact: an attacker holding the SIEM's integration identities can impersonate the platform to external systems, poison log feeds, disable alert routing, or delete forensic evidence. In environments where integration service accounts are over-privileged, the blast radius extends from the SIEM appliance to the connected directory domain or SaaS tenant.

Affected systems. Logsign SIEM releases from 6.4.97 through 6.4.113. The actual exposure per deployment depends on how many integrations the SIEM holds credentials for and the privilege level of those integration accounts. A hardened deployment with least-privilege service accounts limits the blast radius to the data and systems those accounts can reach; an environment using a domain-admin-equivalent LDAP bind account converts this vulnerability into a near-direct domain-compromise primitive.

CVSS reference. Base score 9.0 (Critical), vector CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:L. The critical rating is chiefly driven by the scope change and the high confidentiality/integrity subscores, not by ease of initial access — the PR:H requirement means the realistic threat models are a compromised administrator, a malicious insider with administrative access, or an attacker who chains another vulnerability to reach high privilege. No EPSS score has been published by FIRST.org for this CVE; no score is estimated here. The CVE is not present in CISA's Known Exploited Vulnerabilities catalog at the time of writing, indicating no confirmed exploitation reported to CISA in the provided data.

Detection Guidance

Detection of CWE-522 exploitation is challenging because the triggering behavior is an authorized-looking read of legitimate configuration data. There are no malformed packets, no exploit payload signatures, and no anomalous process execution to alert on. Detection strategy should therefore focus on: (a) privileged users accessing configuration surfaces at unusual times or from unusual source IPs; (b) web responses to those users containing dense credential-like material; (c) follow-on authentication events where SIEM service accounts suddenly appear on other systems; and (d) audit-log gaps in the SIEM itself. The rules below are intentionally generic — no endpoints or function names have been published for this CVE — and must be bound to local Logsign hostnames, account names, and integration inventory.

Sigma Rule

title: Logsign SIEM - Retrieval of Embedded Sensitive Data (CVE-2026-14564)
status: experimental
description: Detects authenticated sessions to Logsign SIEM configuration functionality where the HTTP response body contains credential-like markers, consistent with retrieval of embedded sensitive data (CWE-522).
references:
    - https://nvd.nist.gov/vuln/detail/CVE-2026-14564
tags:
    - attack.credential_access
    - attack.t1552.001
    - cwe.522
    - cve.2026.14564
logsource:
    product: webserver
    category: http
detection:
    selection:
        destination.hostname|contains: logsign
        http.response.status_code: 200
    cred_markers:
        http.response.body|contains:
            - 'password'
            - 'secret'
            - 'api_key'
            - 'BEGIN PRIVATE KEY'
    condition: selection and cred_markers
falsepositives:
    - Legitimate administrators reviewing SIEM integration settings
    - Scheduled configuration exports or backup operations
level: high

Tune the credential-marker list and the hostname wildcard to match the local web-access log schema and Logsign naming convention.

YARA Rule

rule logsign_cve_2026_14564_embedded_creds
{
    meta:
        author      = "Threat Intelligence - valtersit.com"
        description = "Detects files or exported artifacts referencing Logsign that contain embedded credential material, consistent with CWE-522 (CVE-2026-14564). Generic hunting rule; tune to organizational file sets."
        cve         = "CVE-2026-14564"
        cwe         = "CWE-522"
        attck       = "T1552.001"
    strings:
        $a = "logsign" ascii wide nocase
        $b = "password" ascii wide nocase
        $c = "passwd" ascii wide nocase
        $d = "secret" ascii wide nocase
        $e = "api_key" ascii wide nocase
        $f = "BEGIN PRIVATE KEY" ascii wide
    condition:
        $a and 2 of ($b, $c, $d, $e, $f)
}

Expected false positives include legitimate configuration backups and documentation; use this rule for hunting exported artifacts, web-cache captures, and forensic images rather than as a blocking control.

Suricata IDS Rule

alert http $HOME_NET any -> $EXTERNAL_NET any (msg:"ET POLICY Logsign SIEM Response with Embedded Credential Material (CVE-2026-14564)"; flow:established,to_client; http.server; content:"Logsign"; nocase; http.response_body; content:"password"; nocase; http.response_body; content:"secret"; nocase; within:512; reference:url,nvd.nist.gov/vuln/detail/CVE-2026-14564; classtype:attempted-user; sid:2026145641; rev:1;)

This rule flags HTTP responses from a server self-identifying as Logsign that contain multiple credential markers in a single response body, consistent with a configuration view returning embedded secrets. Directionality assumes the Logsign server is inside $HOME_NET — adjust to sensor placement. The within:512 constraint limits false positives from large pages that mention credential words incidentally.

Elastic Detection

sequence by source.ip, user.name with maxspan=15m
  [ authentication where event.outcome == "success"
       and (user.name : "*admin*" or user.name : "*operator*") ]
  [ network where event.category == "web"
       and destination.hostname : "*logsign*"
       and http.response.status_code == 200
       and (http.response.body : "*password*"
            or http.response.body : "*secret*"
            or http.response.body : "*api_key*") ]

This EQL chains a successful authentication by a privileged account to a subsequent web request toward the Logsign host whose response contains credential markers. The wildcards must be adapted to local hostnames and account naming. Investigate privileged sessions that perform such reads outside approved change windows, and any session in which the account role unexpectedly includes administrative privileges.

Splunk SPL Query

index=* (sourcetype=*logsign* OR "Logsign") ("password" OR "secret" OR "api_key" OR "BEGIN PRIVATE KEY") status=200
| eval privilege_class = if(match(_raw,"(?i)(admin|administrator|operator)"), "privileged", "non_privileged")
| stats count min(_time) max(_time) values(uri) as requested_uri by src_ip user privilege_class host
| where count > 5 OR privilege_class="non_privileged"
| sort - count

The query summarizes web accesses that returned credential-like content, tagging each result by whether the requesting account name appears privileged. The uri field, when present, lets analysts identify which configuration surface was touched — no specific URI is asserted because none is published. Prioritize high counts from a single source IP, non-privileged accounts receiving credential-bearing responses, and activity outside change windows.

Wazuh OSSEC Rule

<group name="logsign,cwe-522,">
    <rule id="100645" level="12">
        <decoded_as>json</decoded_as>
        <field name="program_name">logsign</field>
        <regex>password|secret|api_key|BEGIN PRIVATE KEY</regex>
        <description>Logsign SIEM: possible retrieval of embedded sensitive data (CVE-2026-14564)</description>
        <mitre>
            <id>T1552.001</id>
        </mitre>
        <group>credential_access,</group>
    </rule>
</group>

Place this rule after mapping Logsign application/audit logs into the JSON decoder. Level 12 is intentionally high; add a parent rule with an allowlist for approved configuration-review sessions to suppress scheduled false positives. The program_name and regex fields are the minimal interoperable selection criteria because the NVD description discloses no application log key names.

Mitigation & Patch Guidance

Patch confidence for this CVE is 0/4: no tracked source has published a patch confirmation, vendor security advisory, or knowledge-base article at the time of writing. The NVD version range ("before 6.4.114") implies that release 6.4.114 is the remediation boundary, but this has not been independently corroborated. Operate on the working assumption that versions 6.4.97 through 6.4.113 are vulnerable, and treat any compromise of an administrative account on an affected build as potential credential exfiltration.

1. Immediate mitigations:

   • Restrict management access to the Logsign SIEM web interface by source-IP allowlist, VPN, or jump-host architecture to remove direct network reachability (AV:N) from the Internet.
   • Enforce phishing-resistant MFA on all administrative accounts. PR:H is the gating precondition of this CVE; hardening administrative credentials directly reduces exploitability.
   • Audit all accounts with configuration access; remove dormant and over-privileged accounts. Review the scope of every integration/service account the SIEM uses (LDAP bind, SMTP, databases, log sources) and right-size to least privilege.
   • Rotate all credentials stored or used by the SIEM — integration tokens, bind passwords, database passwords — immediately and again after upgrading, since silent extraction by a compromised administrator account cannot be ruled out.
   • Monitor administrative access and configuration-retrieval behavior using the detection content above; feed SIEM audit logs to an out-of-band collector so a compromised SIEM cannot erase its own traces.

2. Patch/upgrade steps:

   • Upgrade to Logsign SIEM 6.4.114 (or the latest available release) in a maintenance window, following the vendor's documented upgrade procedure. Test the upgrade in staging with production-equivalent integrations first.
   • After upgrade, verify that configuration screens no longer return embedded secrets in a directly usable form; re-rotate integration credentials post-upgrade.
   • Monitor vendor advisory channels and the NVD page until the patch is formally confirmed. Re-assess exposure if 6.4.114 is later determined not to remediate the issue.

3. Long-term hardening:

   • Migrate SIEM integration secrets into an enterprise secrets manager so the platform references secrets dynamically rather than storing them embedded at rest, where the product supports this.
   • Adopt a fixed cadence for rotating integration credentials, and an immediate-rotation policy after any security incident involving SIEM or administrative access.
   • Treat the SIEM as high-value infrastructure: segment it into its own network zone, restrict egress to known integration endpoints, and maintain an immutable, out-of-band record of its audit logs.
   • Add a credential-reuse detection use case: alert when authentications originate from Logsign service accounts to destinations outside the approved integration inventory.

References

1. NVD entry for CVE-2026-14564 — https://nvd.nist.gov/vuln/detail/CVE-2026-14564
2. MITRE CWE-522: Insufficiently Protected Credentials — https://cwe.mitre.org/data/definitions/522.html
3. MITRE ATT&CK T1552.001: Unsecured Credentials — Credentials In Files — https://attack.mitre.org/techniques/T1552/001/
4. CISA Known Exploited Vulnerabilities Catalog (CVE-2026-14564 not listed at time of writing) — https://www.cisa.gov/known-exploited-vulnerabilities-catalog
5. Logsign product site (for vendor and version tracking) — https://www.logsign.com

Threat-actor campaign notes: No campaign attribution, exploit-in-the-wild evidence, public PoC, or Nuclei template was identified in the provided dataset. The CVE is absent from CISA KEV. Until a vendor advisory is published, treat third-party claims of working exploit code for this CVE with suspicion and verify against a staging environment before executing.