Security Resilience

CVE-2023-5967

Mattermost ≤ 7.8.11

Published
06 November 2023
Modified
21 November 2024
Patch / advisory
CVSS Score v3.1 4.3
Click a component to see what it means
Raw vectorCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
EPSS Score 0.0051 42th percentile
Risk Priority 37 floored blend · peak EPSS

CVSS and EPSS are reproduced from their sources (NVD, FIRST EPSS). Risk Priority is our own derived reading, not an NVD score.

Summary

CVE-2023-5967 is a medium-severity Improper Check for Unusual or Exceptional Conditions (CWE-754) vulnerability in Mattermost Mattermost. Its CVSS base score is 4.3 (Medium).

Operationally, ranked at the 42th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

OWASP Top 10 for Web (2025)

EU & UK References

Vulnerability Data

Mattermost fails to properly validate requests to the Calls plugin, allowing an attacker sending a request without a User Agent header to cause a panic and crash the Calls plugin

CWE(s)

Related Threats

CVEs Like This One

CVE-2024-42411Same product: Mattermost Mattermost
CVE-2024-39832Same product: Mattermost Mattermost
CVE-2023-3615Same product: Mattermost Mattermost
CVE-2024-39830Same product: Mattermost Mattermost
CVE-2024-39361Same product: Mattermost Mattermost
CVE-2024-40886Same product: Mattermost Mattermost
CVE-2024-8071Same product: Mattermost Mattermost
CVE-2023-2788Same product: Mattermost Mattermost
CVE-2023-27264Same product: Mattermost Mattermost
CVE-2023-4108Same product: Mattermost Mattermost

Affected Assets

mattermost
mattermost
≤ 7.8.11 · 8.0.0 — 8.0.3 · 8.1.0 — 8.1.2

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

addresses: CWE-754

Requires detection and response to audit logging failures as an unusual or exceptional condition.

addresses: CWE-754

Implements detection of unusual or exceptional conditions followed by safe mode entry, reducing the window for exploitation of unchecked conditions.

addresses: CWE-754

Training ensures users perform required checks for unusual or exceptional conditions as part of contingency roles, limiting attacker leverage from skipped validations.

addresses: CWE-754

IR testing directly validates checks for unusual or exceptional conditions that could indicate security incidents.

addresses: CWE-754

Requires ongoing monitoring of organization-defined metrics and analysis, enabling checks for unusual or exceptional conditions.

addresses: CWE-754

Security testing routinely checks for unusual or exceptional inputs/conditions, identifying missing validation steps that flaw remediation then resolves.

addresses: CWE-754

Requires detection of unusual conditions followed by a controlled transition to the defined failure state.

addresses: CWE-754

MTTF determination forces explicit checks for conditions that precede predictable component failure.

Mitigating Controls (ISO/IEC 27001:2022 Annex A) AI

Derived directly from the weakness types (CWEs) cited in the NVD entry via our AI-authored CWE→ISO cross-walk (authority under review) — links open the control.

A.8.15 Logging partial match
finds

Logging can record unhandled exceptions but does not prevent the weakness itself.

finds

Monitoring may detect symptoms of unhandled conditions but does not eliminate the root weakness.

blocks

Secure development life cycle mandates exception handling and input validation that directly prevent missing checks for unusual conditions.

blocks

Application security requirements explicitly call for handling of exceptional conditions and error paths.

blocks

A.8.27 mandates security-by-design principles (fail securely, least privilege, distrust external input, security-oriented design reviews) that reach some but not most CWE-754 cases; many exceptional-condition checks live in low-level code paths outside architecture-level engineering.

prevents

Secure coding standards directly mandate proper checks for exceptional and unusual conditions.

Hardening callouts derived

DISA STIG baselines are authored against specific weaknesses. Where this CVE cites a broad weakness class, the mapping is not asserted at that abstraction (owner ruling, 2026-09-25: grade only at Base and below), so no rule is shown here rather than a rule shown against the wrong grain.

  • No fine-grained STIG row for CWE-754, a class-level weakness. Rules are authored against its narrower children: CWE-354.

References