# CVE-2026-53837

## Summary

- **CVE ID:** CVE-2026-53837
- **Severity:** MEDIUM
- **CVSS Score:** 6.3 (CVSS:4.0/AV:N/AC:H/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N)
- **CWE:** CWE-636
- **Published:** Jun 12, 2026
- **Last Modified:** Jun 15, 2026

## 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 Products

- OpenClaw — OpenClaw (0)
- OpenClaw — OpenClaw (2026.5.6)

## References

- [CNA](https://github.com/openclaw/openclaw/security/advisories/GHSA-gp79-m99v-gjmh)
- [CNA](https://www.vulncheck.com/advisories/openclaw-missing-channel-type-validation-in-mattermost-event-handlers)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.19%
- **EPSS Percentile:** 8.6

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-10._