VulnerabilityAnalyzed

CVE-2026-53851

OpenClaw before 2026.5.12 contains a notification bypass vulnerability allowing Slack reaction events to enter the agent pipeline despite disabled reaction notifications.

MEDIUM 6.3EPSS 0.19%

Does this matter?

Lower severity and a low EPSS score (0.19%). Track it; it rarely justifies an emergency change on its own.

Description

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.

CVSS 4.0: 6.3 MEDIUMCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/M
EPSS: 0.19% probability · 9th percentile
CISA KEV: Not listed
Weakness: CWE-862
Affected: openclaw/openclaw
Source: disclosure@vulncheck.com

References

https://github.com/openclaw/openclaw/security/advisories/GHSA-fcvx-5cxc-v5p8Vendor Advisory
https://www.vulncheck.com/advisories/openclaw-slack-reaction-event-notification-bypassThird Party Advisory

Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.