CVE-2026-53837: Openclaw

Medium severity, CVSS 5.3. EPSS: 0.3% chance of exploitation in the next 30 days.

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.

Affected products

• Openclaw Openclaw: before 2026.5.6 (fixed in 2026.5.6)

Published 2026-06-12. Last modified 2026-07-23.