CVE-2026-53837 | THREATINT

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.

PUBLISHED Reserved 2026-06-10 | Published 2026-06-12 | Updated 2026-06-15 | Assigner VulnCheck

MEDIUM: 6.3CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

LOW: 3.7CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N

Problem types

Not Failing Securely ('Failing Open')

Product status

Default status

unaffected

Any version before 2026.5.6

affected

2026.5.6 (semver)

unaffected

Credits

zsx (@zsxsoft) reporter

KeenSecurityLab coordinator

qclawer tool

References

github.com/...enclaw/security/advisories/GHSA-gp79-m99v-gjmh (GitHub Security Advisory (GHSA-gp79-m99v-gjmh)) vendor-advisory

www.vulncheck.com/...validation-in-mattermost-event-handlers (VulnCheck Advisory: OpenClaw < 2026.5.6 - Missing Channel Type Validation in Mattermost Event Handlers) third-party-advisory

cve.org (CVE-2026-53837)

nvd.nist.gov (CVE-2026-53837)

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