CVE-2026-53837 Details
Description
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.
A vulnerability allowing improper access control has been identified in OpenClaw versions prior to 2026.5.6. This issue arises in Mattermost event handlers, which fail to properly validate channel type metadata. As a result, attackers can bypass designated direct message policies by sending manipulated Mattermost events that omit channel type information, thereby accessing restricted content.
Users are advised to update to OpenClaw version 2026.5.6 or later. Until then, keep Mattermost bot access restricted and review channel metadata for errors. As a general practice, maintain narrow channel and tool allowlists, avoid sharing one Gateway between mutually untrusted users, and disable the affected feature when not needed.
Metrics
CVSS 4.0 Severity and Vector Strings:
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Jun 15, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/openclaw/openclaw/security/advisories/GHSA-gp79-m99v-gjmh | [email protected] | MitigationVendor Advisory |
| https://www.vulncheck.com/advisories/openclaw-missing-channel-type-validation-in-mattermost-event-handlers | [email protected] | Third Party Advisory |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-636 | Not Failing Securely ('Failing Open') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| openclaw openclaw | < 2026.5.6 |
CPE
Remediation
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Change History
5 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 23, 2026 | CVE Translated | [email protected] |
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Jun 16, 2026 | Initial Analysis | [email protected] |
| Jun 12, 2026 | New CVE Received | [email protected] |