CVE-2026-53837

LOW 3.7

OpenClaw < 2026.5.6 - Missing Channel Type Validation in Mattermost Event Handlers

CVSS Score

3.7

EPSS Score

0.0%

EPSS Percentile

0th

OpenClaw before 2026.5.6 contains an improper access control vulnerability in Mattermost event handlers that fails to validate channel type metadata. Attackers can bypass intended DM policy decisions by sending crafted Mattermost events missing channel type information to process restricted content.

CWE	CWE-636
Vendor	openclaw
Product	openclaw
Published	Jun 12, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack Vector

Network

Attack Complexity

High

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

Affected Versions

OpenClaw / OpenClaw

0 < 2026.5.6

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/openclaw/openclaw/security/advisories/GHSA-gp79-m99v-gjmh vulncheck.com: https://www.vulncheck.com/advisories/openclaw-missing-channel-type-validation-in-mattermost-event-handlers

Credits

🔍 zsx (@zsxsoft) KeenSecurityLab qclawer