Auth bypass in Openclaw
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. Attackers can trigger unintended agent processing by sending reaction events when the feature is enabled, potentially leading to unauthorized processing of lower-trust input.
Vulnerability class: Broken Access Control
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N.
EPSS exploit prediction
EPSS: 0.003 (22.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 23rd percentile — 22.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.003 · change: +0.001
Affected products
- Openclaw — versions 0, 2026.5.12
Weakness classification (CWE)
References
- github.com/openclaw/openclaw/security/advisories/GHSA-fcvx-5cxc-v5p8 (vendor-advisory, Vendor Advisory)
- www.vulncheck.com/advisories/openclaw-slack-reaction-event-notification-bypass (Third Party Advisory, third-party-advisory)
Frequently asked questions
- What is CVE-2026-53851?
- CVE-2026-53851 is a medium-severity vulnerability in Openclaw, classified under Missing Authorization. CVSS score: 5.3/10. Published 2026-06-16.
- How severe is CVE-2026-53851?
- Medium severity. CVSS v3 base score is 5.3 out of 10.