CVE-2026-63315

Executive Summary

CVE-2026-63315 is a plaintext credential storage vulnerability (CWE-256) in the WebCTI service component of Slican IPx telephone exchanges, where temporary subscriber passwords are persisted without encryption or hashing. Any attacker who gains access to the underlying database — whether through a separate compromise, backup exfiltration, or privileged local access — can recover subscriber credentials in cleartext and use them to authenticate as the affected subscriber. Slican IPx deployments running firmware older than 6.62.0100 are impacted; the issue carries no public PoC, no CISA KEV listing, and a low EPSS score (0.00288, ~19.9th percentile), indicating limited observed exploitation to date.

Technical Analysis

The vulnerability class is CWE-256: Plaintext Storage of a Password. The WebCTI service for Slican IPx telephone exchanges stores temporary subscriber passwords in a recoverable, unprotected form within its data store. Because the secret is not hashed or encrypted at rest, the confidentiality of the credential depends entirely on the confidentiality of the database itself — a defense-in-depth failure that collapses a two-layer protection model into a single point of trust.

Key technical characteristics derivable from the advisory:

• Credential type: "temporary subscriber password" — the short-lived credential issued to subscribers of the IPx exchange, presumably used during provisioning, WebCTI portal access, or initial account setup.
• Storage flaw: Plaintext storage, meaning the database column/field holding the password contains the literal secret rather than a salted hash. There is no cryptographic work factor to slow an attacker once the store is read.
• Attack surface: The vulnerability is not remotely reachable through WebCTI itself; it requires "access to the database." This is a post-compromise or insider-abuse vector, not a pre-auth remote exploit. The attack surface is therefore: database files, backups, replicas, and any principal with read access to the WebCTI data store.
• Trust boundary violated: Temporary credentials are frequently treated as low-value and therefore often under-protected in embedded/VoIP products. Here, the product treats the temporary password as recoverable even after issuance, which means the credential retains full authentication value ("log in to the subscriber's account") for its lifetime.

The specific database engine, table name, column name, hashing routine (or absence thereof), and WebCTI internals are not specified in the provided NVD description. No code-level identifiers or storage paths are available; analysis is therefore restricted to the vulnerability class and its storage-at-rest mechanism.

Severity framing: CVSS is not assigned in the supplied data (N/A). The vector above is a provisional, class-based estimate reflecting a local/adjacent access precondition (AV:L), low complexity (AC:L), low privilege required to read a database the attacker can already reach (PR:L), no user interaction (UI:N), and high confidentiality/integrity impact on the subscriber account (C:H/I:H) with no availability impact (A:N). This should be treated as analyst-derived, not authoritative.

Exploitation Scenarios

No public PoC or exploit code exists for CVE-2026-63315; the attack chain below is inferred strictly from the vulnerability class (CWE-256) and the advisory wording. No specific function names, endpoints, tables, or parameters are invented.

Step 1 — Reconnaissance / target identification. The attacker identifies a Slican IPx telephone exchange running a vulnerable firmware version (< 6.62.0100) and determines that the WebCTI service and its backing database are present. In practice this occurs after the attacker has already obtained a foothold with database read access — for example, via a compromised administrative host, a leaked/stolen backup, an exposed database service, or a malicious insider. The precondition ("access to the database") is the gate for the entire chain.

Step 2 — Triggering the flaw class. The attacker reads the WebCTI data store directly. Because subscriber temporary passwords are stored in plaintext, no cracking, brute-forcing, or cryptographic attack is required. The flaw is triggered passively by the act of reading the credential field; there is no exploit primitive, memory corruption, or injection needed to expose the secret. This is characteristic of plaintext-storage findings: exploitation is equivalent to unauthorized data access.

Step 3 — Credential recovery at the vulnerability-class level. The attacker extracts the cleartext temporary subscriber password(s) from the database. At the class level, this is an offline credential-recovery step against local data — not an on-the-wire attack. Any temporary password still within its validity window is immediately usable; expired ones are of no further value.

Step 4 — Post-exploitation impact. Using the recovered credential, the attacker logs in to the subscriber's account ("An attacker with access to the database can obtain the user's password and log in to the subscriber's account"). Consequences include impersonation of the subscriber on the IPx/WebCTI interface, unauthorized access to that subscriber's telephony configuration and data, and potential lateral movement or abuse of subscriber-level privileges. Because the same credential may be reused elsewhere by the subscriber, spillover risk to other systems exists but is not stated in the advisory.

Impact Assessment

Confidentiality: High. Subscriber passwords are exposed in cleartext to any principal with database read access, defeating the secrecy of the credential entirely.

Integrity: High. Possession of a valid subscriber password permits authentication and subsequent account actions as the subscriber, enabling configuration changes and abuse of account privileges.

Availability: None indicated. The vulnerability does not affect service uptime.

Blast radius / affected systems: Slican IPx telephone exchanges running WebCTI on firmware versions prior to 6.62.0100. The exposure is scoped to subscribers whose temporary passwords are resident in the data store at the time of access — in a multi-tenant or enterprise IPx deployment, this may be a broad set of accounts, though all subscribers provisioned through WebCTI within the password retention window should be presumed affected.

Subscore reference: The advisory provides no official CVSS score or vector; no authoritative subscores exist to cite (CVSS: N/A). The provisional vector in METADATA should be used only as an internal triage aid. EPSS is 0.00288 (~19.9th percentile), suggesting low near-term exploitation likelihood based on observed signals. CISA KEV: NO.

Business impact: For enterprises operating Slican IPx voice infrastructure, the primary risk is credential compromise of PBX subscriber accounts following any database-touching incident. Combined with the fact that the secret is temporary but appears to be stored recoverably, the window of exposure extends beyond the intended ephemeral lifetime of the credential.

Detection Guidance

Detection for a plaintext-storage flaw is inherently indirect: there is no injection payload or malformed request to signature. Defenders must monitor (a) unauthorized access to the WebCTI database/backups, (b) abnormal database read volume, and (c) anomalous subscriber authentications from new sources. The rules below target these behaviors at the host, file, network, and authentication layers.

Sigma Rule

title: Slican IPx WebCTI Plaintext Credential Store Access
id: 8f3c1d2a-4b6e-4c7d-9a10-77c2e5b9d4f1
status: experimental
description: Detects suspicious access to the WebCTI service database backing Slican IPx exchanges, where temporary subscriber passwords are stored in plaintext (CVE-2026-63315).
references:
  - https://nvd.nist.gov/vuln/detail/CVE-2026-63315
author: Threat Intelligence
date: 2026/01/01
tags:
  - attack.credential_access
  - attack.t1555
logsource:
  product: linux
  category: process_creation
detection:
  selection_db_tools:
    Image|endswith:
      - '/sqlite3'
      - '/mysql'
      - '/mysqldump'
      - '/psql'
      - '/pg_dump'
  selection_webcti_path:
    CommandLine|contains:
      - 'webcti'
      - 'slican'
      - 'ipx'
  condition: selection_db_tools and selection_webcti_path
falsepositives:
  - Legitimate administrative database maintenance by authorized PBX administrators
level: medium

YARA Rule

rule CVE_2026_63315_WebCTI_Plaintext_Credential_Store
{
    meta:
        description = "Detects database/backup artifacts associated with Slican IPx WebCTI that may contain plaintext temporary subscriber passwords (CVE-2026-63315)"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-63315"
        author = "Threat Intelligence"
        date = "2026-01-01"
        severity = "high"

    strings:
        $webcti  = "webcti" ascii nocase
        $webcti2 = "WebCTI" ascii
        $slican  = "slican" ascii nocase
        $ipx     = "IPx" ascii
        $pw1     = "password" ascii nocase
        $pw2     = "passwd" ascii nocase
        $sub     = "subscriber" ascii nocase

    condition:
        filesize < 50MB and
        (
            (any of ($webcti, $webcti2) and any of ($pw1, $pw2)) or
            ($slican and $ipx and any of ($pw1, $pw2, $sub))
        )
}

Suricata IDS Rule

alert tcp $HOME_NET any -> $HOME_NET any (msg:"CVE-2026-63315 Possible WebCTI Database Credential Store Access (Slican IPx)"; flow:established,to_server; content:"webcti"; nocase; content:"select"; nocase; distance:0; pcre:"/(password|passwd)/i"; classtype:credential-theft; sid:202663315; rev:1; reference:cve,2026-63315; metadata:affected_product "Slican_IPx", created_at 2026_01_01;)

Elastic Detection

process where event.type == "start" and
  process.name in ("sqlite3", "mysql", "mysqldump", "psql", "pg_dump") and
  (
    process.command_line : "*webcti*" or
    process.command_line : "*slican*" or
    process.command_line : "*ipx*"
  )

Splunk SPL Query

index=endpoint OR index=linux
(process_name=sqlite3 OR process_name=mysql OR process_name=mysqldump OR process_name=psql OR process_name=pg_dump)
(process=*webcti* OR process=*slican* OR process=*ipx* OR command_line=*webcti* OR command_line=*slican*)
| stats count values(command_line) as cmd by host, user
| where count > 0
| table host, user, count, cmd

Wazuh OSSEC Rule

<group name="slican,webcti,credential_access,">
  <rule id="2026315" level="10">
    <if_sid>550</if_sid>
    <field name="command">\.*(sqlite3|mysql|mysqldump|psql|pg_dump)\.*</field>
    <match>webcti|slican|ipx</match>
    <description>CVE-2026-63315: Suspicious access to Slican IPx WebCTI database potentially exposing plaintext subscriber passwords</description>
    <mitre>
      <id>T1555</id>
    </mitre>
    <group>credential_theft,</group>
  </rule>
</group>

Mitigation & Patch Guidance

Patch confidence: 0/4 (UNPATCHED — no patch evidence from any tracked source). Note: the vendor advisory states the issue was "fixed in IPx series version 6.62.0100," but no patch artifact, commit, or advisory link has been independently confirmed in tracked sources; treat this as version guidance rather than a verified patch chain.

1. Immediate mitigations

   • Restrict and audit database access to the WebCTI data store. Enforce least privilege so that only essential WebCTI service accounts can read subscriber credential data, and remove read access from administrative and backup accounts that do not require it.
   • Inventory and secure backups. Any backup taken before remediation may contain plaintext temporary subscriber passwords; encrypt backup stores, restrict access, and rotate credentials after any suspected backup exposure.
   • Force rotation of all temporary subscriber passwords, and reduce their retention window so cleartext secrets are retained only for the minimum operational period.
   • Monitor for unauthorized database reads and for subscriber account logins from unexpected sources (see Detection Guidance).
   • Treat any host with database read access as a credential-compromise risk and apply endpoint hardening (host firewall, EDR, MFA on management paths where WebCTI supports it).

2. Patch / upgrade steps

   • Upgrade Slican IPx firmware to version 6.62.0100 or later, per the advisory statement.
   • Verify upgrade completion through the device management interface and confirm the firmware build matches or exceeds 6.62.0100.
   • After upgrade, rotate all subscriber passwords provisioned before remediation, since prior cleartext exposure cannot be undone by patching alone.

3. Long-term hardening

   • Demand hashing with a modern, salted password-hashing algorithm (e.g., Argon2/bcrypt/PBKDF2) for any stored credential — never plaintext — as a procurement and vendor-accountability requirement for VoIP/PBX platforms.
   • Apply data-at-rest encryption to the WebCTI database.
   • Enforce credential rotation and short-lived temporary password policies, plus monitoring for reuse.
   • Avoid credential reuse between PBX subscriber accounts and other enterprise systems.
   • Establish a firmware/vulnerability management cadence for voice infrastructure, networks that are frequently overlooked in enterprise patch programs.

References

• NVD — CVE-2026-63315: https://nvd.nist.gov/vuln/detail/CVE-2026-63315
• CWE-256: Plaintext Storage of a Password — https://cwe.mitre.org/data/definitions/256.html
• MITRE ATT&CK T1555 — Credentials from Password Stores: https://attack.mitre.org/techniques/T1555/
• Slican vendor product/firmware information for IPx series (referencing fixed version 6.62.0100) — verify via official Slican support channels.
• CISA Known Exploited Vulnerabilities catalog — not listed for this CVE (status: NO as of reporting).

No public proof-of-concept, exploit code, or Nuclei template was identified for CVE-2026-63315 at time of writing. No known threat actor campaigns or exploit-in-the-wild evidence are associated with this CVE. EPSS 0.00288 (~19.9th percentile) and KEV status NO indicate a low current exploitation likelihood based on available signals.