CVE-2026-53837 OpenClaw < 2026.5.6 - Missing Channel Type Validation in Mattermost Event Handlers

What is CVE-2026-53837?

CVE-2026-53837 is a medium-severity missing authorization vulnerability in Openclaw Openclaw, published on 12 Jun 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

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.

Weakness: CWE-636

Which versions are affected by CVE-2026-53837?

2 open source packages ship an affected version, including openclaw. It affects 1 product.

Products include Openclaw Openclaw.

How do I fix CVE-2026-53837?

Upgrade openclaw to 2026.5.6 or later.

Upgrade, and check permissions on every request on the server, not only in the interface. More about Missing authorization.

Is CVE-2026-53837 being exploited?

There is no known exploitation of CVE-2026-53837 in the wild and no public exploit code.

Other vulnerabilities in Openclaw Openclaw

• CVE-2026-28363 Security feature bypass in OpenClaw Critical 9.9
• CVE-2026-30741 Code injection in n/a Critical 9.8
• CVE-2026-33579 OpenClaw < 2026.3.28 - Privilege Escalation via Missing Caller Scope Validation in Device Pair Approval Critical 9.4
• CVE-2026-32922 OpenClaw < 2026.3.11 - Privilege Escalation via Unvalidated Scope in device.token.rotate Critical 9.4
• CVE-2026-32978 OpenClaw < 2026.3.11 - Approval Bypass via Unrecognized Script Runners Critical 9.4

All Openclaw Openclaw vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-gp79-m99v-gjmh, MINI-232m-47cv-3p9v, MINI-93xj-fqgc-4c4f.