CVE-2026-53851: OpenClaw before 2026.5.12 contains a notification bypass vulnerability allowing Slack reaction events to enter

Routine

MEDIUM 5.3REMOTEUPGRADE

CVE-2026-53851 is a medium-severity flaw (CVSS 5.3) affecting openclaw. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	5.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 91%)
CISA exploited list	No
Weakness	CWE-862
Published	2026-06-16
Last modified	2026-10-25

Publisher (CNA): VulnCheck · Vendor: openclaw

Last updated 2026-10-25 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-16 19:17 UTCPublished CVE record published
2026-10-25 23:10 UTCUpdated Record last modified

openclaw openclaw UPGRADE

Affected: < 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 · 2026.5.12 beta7

Fixed in: 2026.5.12

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls openclaw

2. UPGRADE to 2026.5.12

npm install openclaw@">=2026.5.12"

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-53851?

openclaw: upgrade to 2026.5.12. Exact commands for each OS are on this page.

Is CVE-2026-53851 being exploited?

CVE-2026-53851 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-53851 affect?

CVE-2026-53851 affects openclaw. Severity is medium (CVSS 5.3). 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

How urgent is CVE-2026-53851?

Priority 26/100. Remotely exploitable, no login, no user action

Software pages

Slack vulnerabilities

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References

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