Vulnerability · Published Jun 12, 2026 · Assigned by VulnCheck
CVE-2026-53837OpenClaw < 2026.5.6 - Missing Channel Type Validation in Mattermost Event Handlers
Low 3.7
In plain English
A low-severity security flaw in OpenClaw from OpenClaw. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 9% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)3.7Low
Exploit odds (30 days)0.2%top 91.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| npm | openclaw | 2026.5.6 | GHSA-gp79-m99v-gjmh |
Affected products (as reported)
Weakness: CWE-636 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N
References
- GitHub Security Advisory (GHSA-gp79-m99v-gjmh) vendor-advisory
- VulnCheck Advisory: OpenClaw < 2026.5.6 - Missing Channel Type Validation in Mattermost Event Handlers third-party-advisory