CVE-2026-53837 (GCVE-0-2026-53837)
Vulnerability from cvelistv5 – Published: 2026-06-12 21:57 – Updated: 2026-06-15 15:10 X_Open Source
VLAI
EPSS
VEX
Title
OpenClaw < 2026.5.6 - Missing Channel Type Validation in Mattermost Event Handlers
Summary
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.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-06-15 15:09 UTC
CWE
- CWE-636 - Not Failing Securely ('Failing Open')
Assigner
VulnCheck
CNA
References
2 references
| URL | Tags |
|---|---|
| https://github.com/openclaw/openclaw/security/adv… | vendor-advisory |
| https://www.vulncheck.com/advisories/openclaw-mis… | third-party-advisory |
Impacted products
Date Public
2026-05-28 00:00
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
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Browse all ATT&CK techniques and the vulnerabilities related to each.
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