What’s Vulnerable › Vulnerabilities

CVE-2026-53851: OpenClaw < 2026.5.12 - Slack Reaction Event Notification Bypass

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-16 · updated 2026-10-25
• Weakness: CWE-862

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.

Affected products

• OpenClaw: before 2026.5.12; 2026.5.12-beta1, 2026.5.12-beta2, 2026.5.12-beta3, 2026.5.12-beta4, 2026.5.12-beta5, 2026.5.12-beta6 (+2) — fixed in 2026.5.12

How to fix

Upgrade to a fixed version: OpenClaw 2026.5.12. Check the vendor advisory for mitigations.

References

• https://github.com/openclaw/openclaw/security/advisories/GHSA-fcvx-5cxc-v5p8
• https://www.vulncheck.com/advisories/openclaw-slack-reaction-event-notification-bypass

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