CVE-2026-53837 MEDIUM

CVE-2026-53837: OpenClaw < 2026.5.6 - Missing Channel Type Validation in Mattermost Event Handlers

Vendor Openclaw
Product OpenClaw
Weakness CWE-636
Published June 12, 2026
Last update June 15, 2026
View on NVD All CVEs

CVSS base score

6.3/10
Attack vector Network
Attack complexity High
Privileges required None
User interaction None
Confidentiality —
Integrity —

CVSS vector

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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

June 12, 2026 CVE published
June 15, 2026 Record updated