CVE-2026-53851

Name: CVE-2026-53851
Creator: NVD / NIST
Published: 2026-06-16T19:17:02.327+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 6.3/10EPSS 0.19%

Last modified Jun 17, 2026

CVE-2026-53851 is a medium-severity vulnerability rated 6.3/10 on the CVSS scale. 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.. EPSS estimates a 0.19% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

5.3/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

CVSS 4.0

6.3/10

CVSS: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/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS Probability

0.19%

9.0th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-862

Affected Software

Vendor	Product	Versions	Update
Openclaw	Openclaw	< 2026.5.12	—
Openclaw	Openclaw	2026.5.12	Beta1

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

Timeline

Published: Jun 16, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-53851?

How severe is CVE-2026-53851?

CVE-2026-53851 has a CVSS score of 6.3/10 (MEDIUM severity). The EPSS model estimates a 0.19% probability of exploitation in the next 30 days.

How do I fix CVE-2026-53851?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-53851?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST