CVE-2026-53851: Openclaw

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

OpenClaw before 2026.5.12 contains a notification bypass vulnerability allowing Slack reaction events to enter the agent pipeline despite disabled reaction notifications. Attackers can trigger unintended agent processing by sending reaction events when the feature is enabled, potentially leading to unauthorized processing of lower-trust input.

Affected products

• Openclaw Openclaw: before 2026.5.12 (fixed in 2026.5.12); version 2026.5.12 only

Published 2026-06-16. Last modified 2026-06-17.