CVE-2026-53837: OpenClaw before 2026.5.6 contains an improper access control vulnerability in Mattermost event handlers that f

Routine

LOW 3.7REMOTEUPGRADE

CVE-2026-53837 is a low-severity flaw (CVSS 3.7) affecting openclaw. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

OpenClaw before 2026.5.6 contains an improper access control vulnerability in Mattermost event handlers that fails to validate channel type metadata. Attackers can bypass intended DM policy decisions by sending crafted Mattermost events missing channel type information to process restricted content.

Why this priority

Remotely exploitable, no login, no user action

A fixed release or distro patch exists.

Risk facts

CVSS score	3.7 (Low)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-636
Published	2026-06-12
Last modified	2026-07-23

Publisher (CNA): VulnCheck · Vendor: openclaw

Last updated 2026-07-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-12 22:16 UTCPublished CVE record published
2026-07-23 09:10 UTCUpdated Record last modified

openclaw openclaw UPGRADE

Affected: < 2026.5.6

Fixed in: 2026.5.6

Safe to downgrade to: no unaffected older release

1. Check installed version

npm ls openclaw

2. UPGRADE to 2026.5.6

npm install openclaw@">=2026.5.6"

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-2026-53837?

openclaw: upgrade to 2026.5.6. Exact commands for each OS are on this page.

Is CVE-2026-53837 being exploited?

CVE-2026-53837 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-2026-53837 affect?

CVE-2026-53837 affects openclaw. Severity is low (CVSS 3.7). OpenClaw before 2026.5.6 contains an improper access control vulnerability in Mattermost event handlers that fails to validate channel type metadata. Attackers can bypass intended DM policy decisions by sending crafted Mattermost events mis

How urgent is CVE-2026-53837?

Priority 20/100. Remotely exploitable, no login, no user action

Software pages

Mattermost vulnerabilities

Related CVEs

CVE-2026-53855 HIGH 8.1 UPGRADE OpenClaw before 2026.4.2 contains an inline-eval bypass vulnerability allowing authenticated operators to weak
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CVE-2026-53851 MEDIUM 5.3 UPGRADE OpenClaw before 2026.5.12 contains a notification bypass vulnerability allowing Slack reaction events to enter
CVE-2026-53846 HIGH 7.1 UPGRADE OpenClaw before 2026.4.29 contains a path traversal vulnerability in the install helper that allows workspace
CVE-2026-59261 HIGH 7.1 UPGRADE OpenClaw before 2026.5.28 contains a credential exposure vulnerability where workspace dotenv files can overri

References

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