medium3.7
CVE-2026-53837
OpenClaw before 2026.5.6 contains an improper access control vulnerability in Mattermost event handlers that fails to validate channel type metadata.
Impact
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
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| npm | openclaw | <= 2026.5.5 | 2026.5.6 |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Openclaw | Openclaw | before 2026.5.6 |
Weakness classification
References
- NVD record
- CVE.org record
- GitHub advisory
- https://github.com/advisories/GHSA-gp79-m99v-gjmh
- https://github.com/openclaw/openclaw/security/advisories/GHSA-gp79-m99v-gjmh
- https://nvd.nist.gov/vuln/detail/CVE-2026-53837
- https://www.vulncheck.com/advisories/openclaw-missing-channel-type-validation-in-mattermost-event-handlers