CVE-2026-103371

Executive Summary

CVE-2026-103371 is an information-disclosure vulnerability in the Apache Geode Web Management component, classified as CWE-532 (Insertion of Sensitive Information into Log File). It affects Apache Geode versions from 2.0.0 before 2.0.3, allowing sensitive data to be written into log files where it may be exposed to unauthorized readers. With a CVSS base score of 7.5 (High), an unauthenticated network-reachable attacker who gains read access to log output can obtain confidential information; no exploit code, PoC, or Nuclei template is currently public, and the vulnerability is not listed in CISA KEV.

Technical Analysis

The vulnerability falls under CWE-532, Insertion of Sensitive Information into Log File. This class of weakness occurs when an application writes confidential data — such as credentials, session tokens, secrets, or personally identifiable information — into log files without redaction or access controls. In the context of the Apache Geode Web Management interface, the flaw means that data handled by the management component is persisted to log output in a form that exposes it to parties who should not have access.

The affected range is Apache Geode 2.0.0 through 2.0.2; version 2.0.3 is identified by the vendor as the fix release. The NVD description does not enumerate the specific fields, parameters, endpoints, or log file paths involved, and no CNA title was supplied. Consequently, the exact sensitive data element and the precise logging call site cannot be confirmed from available data. What can be stated from the classification and CVSS vector is the attack surface: the Geode Web Management interface is network-accessible, and the confidentiality impact is rated High (C:H) with no integrity or availability impact (I:N/A:N).

The CVSS 3.1 vector AV:N/AC:L/PR:N/UI:N indicates the attack is launchable over the network, requires low complexity, no privileges, and no user interaction. This profile is consistent with a scenario in which an attacker reaches log artifacts — either through the management interface itself, a file exposure path, or shared log storage — and reads sensitive content that should have been redacted. Because the weakness is a logging hygiene defect rather than an injection or memory-safety flaw, exploitation does not require crafting a malicious request payload; it requires access to the emitted log data.

The lack of published patch metadata (patch confidence 0/4, empty patch sources) and the absence of a workaround in the supplied data mean defenders must rely on the vendor's stated fixed version, 2.0.3, for remediation. No OSV package mappings or affected version arrays were provided, so downstream package-manager impact cannot be enumerated from this dataset.

Exploitation Scenarios

No public PoC or exploit code is available for CVE-2026-103371; the attack chain below is inferred strictly from the vulnerability class (CWE-532) and the CVSS vector, not from observed exploitation.

1. Reconnaissance and target identification. An attacker identifies internet- or intranet-exposed Apache Geode Web Management deployments. Shodan and similar engines can be used to locate Geode web interfaces via product/title/banner matching. Because the CVSS vector specifies PR:N/UI:N, the attacker does not need valid credentials or victim interaction to satisfy the attack preconditions.

2. Triggering the flaw class. The weakness is triggered whenever the affected Geode Web Management component processes sensitive data and writes it, unredacted, into a log file. Unlike injection flaws, no specially crafted request is required to "activate" the defect; normal use of the management interface causes sensitive content to be logged. The attacker's task is therefore to cause sensitive operations to be logged and then obtain the resulting log output.

3. Access and extraction at the vulnerability-class level. The attacker obtains read access to the log file — for example through a path or interface that exposes log artifacts, misconfigured file permissions, or shared/centralized log storage that is reachable from the attacker's position. The sensitive data is then read directly from the log. (No specific endpoint, filename, or parameter is named in the source description and none is asserted here.)

4. Post-exploitation impact. Successful exploitation yields confidentiality loss consistent with C:H — exposure of the sensitive information that was improperly logged. Because I:N and A:N, the attacker does not modify data or disrupt service through this CVE. The disclosed secrets may, however, be used as a pivot for lateral movement or privilege escalation in follow-on activity, depending on what was logged; that downstream use is not part of this CVE's direct impact.

Impact Assessment

The CVSS 3.1 base score is 7.5 (High), vector CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N. The subscores are decisive: network attack vector, low complexity, no privileges required, and no user interaction make the flaw trivially reachable for any party who can access the log artifacts. The scope is unchanged (S:U), so impact is confined to the vulnerable Geode component's security authority. Confidentiality is High (C:H), while integrity and availability are None.

From a business perspective, the impact is exposure of confidential data that should never have been written to logs. Depending on the application, that could include credentials, tokens, or other secrets, which raises the risk of account takeover, lateral movement, and further compromise beyond the initial instance. Because EPSS is low (0.00173, ~6.2nd percentile) and no exploit or PoC is public, opportunistic mass exploitation is unlikely in the near term; the realistic threat is targeted or insider access to log data and exposure via internet-reachable management interfaces. Affected systems are Apache Geode 2.0.0 through 2.0.2 deployments that use the Web Management component and whose logs are readable by unauthorized parties. The blast radius depends on deployment topology and on what sensitive data the management interface emits, which the source description does not specify.

Detection Guidance

Sigma Rule

title: Potential Sensitive Information Exposure via Apache Geode Web Management Logs
id: 3b8f1c62-5a4d-4e2f-9c71-0a1d2e3f4b5c
status: experimental
description: Detects access to Apache Geode Web Management log files that may contain sensitive information (CWE-532, CVE-2026-103371).
references:
  - https://nvd.nist.gov/vuln/detail/CVE-2026-103371
author: valtersit.com
date: 2026-01-01
logsource:
  category: file_access
  product: linux
detection:
  selection_path:
    TargetFilename|contains:
      - 'geode'
      - 'logs'
  selection_ext:
    TargetFilename|endswith:
      - '.log'
  selection_proc:
    Image|endswith:
      - '/cat'
      - '/less'
      - '/more'
      - '/tail'
      - '/head'
      - '/grep'
  condition: selection_path and selection_ext and selection_proc
falsepositives:
  - Legitimate administrative log review
  - Log rotation and monitoring agents
level: medium
tags:
  - attack.collection
  - attack.t1213
  - cve.2026.103371

YARA Rule

rule CVE_2026_103371_Apache_Geode_Log_Disclosure
{
    meta:
        description = "Detects Apache Geode Web Management log files potentially containing sensitive information (CWE-532)"
        author = "valtersit.com"
        reference = "https://nvd.nist.gov/vuln/detail/CVE-2026-103371"
        date = "2026-01-01"
        severity = "high"

    strings:
        $geode   = "Apache Geode" ascii wide nocase
        $webmgmt = "Web Management" ascii wide nocase
        $logmark = "geode" ascii nocase
        $cred1   = "password" ascii nocase
        $cred2   = "credential" ascii nocase
        $cred3   = "token" ascii nocase
        $cred4   = "secret" ascii nocase

    condition:
        uint16(0) == 0x0A0D or $geode or ($logmark and 1 of ($cred*))
}

Suricata IDS Rule

alert http any any -> any any (msg:"CVE-2026-103371 Apache Geode Web Management Sensitive Information Exposure Attempt"; flow:established,to_server; http.uri; content:"geode"; nocase; http.uri; content:"log"; nocase; http.method; content:"GET"; classtype:attempted-recon; reference:cve,2026-103371; reference:url,nvd.nist.gov/vuln/detail/CVE-2026-103371; sid:2026103371; rev:1; metadata:created_at 2026_01_01, updated_at 2026_01_01;)

Elastic Detection

file where process.name in ("cat", "less", "more", "tail", "head", "grep", "vi", "nano") and
file.path : ("*geode*log*", "*geode*logs*", "*geode*.log") and
event.action == "access"

Splunk SPL Query

index=* (sourcetype=linux_audit OR sourcetype=sysmon OR sourcetype=fs_notification)
(process_name IN ("cat","less","more","tail","head","grep","vi","nano"))
(file_path="*geode*" OR file_name="*.log")
| stats count min(_time) as first_seen max(_time) as last_seen
        values(process_name) as procs values(user) as users
        by host file_path
| where count > 0
| convert ctime(first_seen) ctime(last_seen)

Wazuh OSSEC Rule

<group name="apache_geode,cve_2026_103371,">
  <rule id="103371" level="10">
    <if_sid>550</if_sid>
    <field name="file">geode</field>
    <match>\.log$</match>
    <description>CVE-2026-103371: Possible access to Apache Geode Web Management log file containing sensitive information (CWE-532)</description>
    <mitre>
      <id>T1213</id>
    </mitre>
    <group>data_exfiltration,gdpr_IV_35.7.d,</group>
  </rule>
</group>

Mitigation & Patch Guidance

Patch confidence: 0/4 (UNPATCHED — no patch evidence from any tracked source).

1. Immediate mitigations (no vendor workaround was published in the supplied data):

• Restrict network access to the Apache Geode Web Management interface using firewall rules, reverse-proxy ACLs, or a bastion, so it is not reachable by untrusted users (the CVSS vector is AV:N/PR:N, so exposure reduction is the highest-value control).
• Harden log-file permissions and storage: apply least-privilege ownership (e.g., a dedicated service account), enforce restrictive file modes, and avoid placing Geode logs on shared or world-readable volumes.
• Isolate and protect centralized log aggregation so that Geode logs are not readable by parties without a need to know.
• Monitor and rotate logs, and treat any already-captured Geode Web Management logs as potentially sensitive — review, redact, and securely delete copies that may contain secrets.

2. Patch / upgrade steps:

• Upgrade Apache Geode to version 2.0.3, which the vendor states fixes this issue. Rebuild/redeploy the Geode Web Management component and verify the running version post-upgrade.
• Because patch confidence is 0/4 and vendor-fix metadata was not indexed in the supplied sources, confirm the fix against the official Apache Geode security advisory and release notes before relying solely on the version string.

3. Long-term hardening:

• Embed a data-classification and log-redaction policy so that credentials, tokens, and other secrets are never written to logs (addresses CWE-532 at the source).
• Adopt secure logging libraries and central redaction, and add regression tests that assert no sensitive fields appear in log output.
• Maintain external exposure inventory for management interfaces and apply continuous attack-surface monitoring.

References

• NVD — CVE-2026-103371: https://nvd.nist.gov/vuln/detail/CVE-2026-103371
• CWE-532: Insertion of Sensitive Information into Log File — https://cwe.mitre.org/data/definitions/532.html
• Apache Geode project security advisories: https://geode.apache.org/
• Apache Software Foundation security page: https://www.apache.org/security/
• CISA Known Exploited Vulnerabilities catalog (CVE-2026-103371 not listed as of this report): https://www.cisa.gov/known-exploited-vulnerabilities-catalog

No threat actor campaigns, exploit-in-the-wild evidence, public PoC, or Nuclei template were identified for CVE-2026-103371 at the time of writing.