CVE-2026-53837 json
OpenClaw < 2026.5.6 - Missing Channel Type Validation in Mattermost Event Handlers
published 5mo ago modified 2mo ago also EUVD-2026-36625 , GHSA-gp79-m99v-gjmh
- cvss
- 3.7
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.2%
- EPSS 0.2% chance of exploitation in 30 days, percentile 8%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- npm openclaw 2026.5.6
- OpenClaw OpenClaw 2026.5.6
Is CVE-2026-53837 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 4mo ago
Exploit prediction
0.19% chance of exploitation in the next 30 days, higher than 8% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 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 |
| CNA | 3.1 | 3.7 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N |
| GitHub | 3.1 | 3.7 | CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N |
| CNA | 4.0 | 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
| NVD | 3.1 | 5.3 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| npm | openclaw | <2026.5.6 |
2026.5.6 |
Affected products
- OpenClaw OpenClaw
Classification
- Weakness
-
- CWE-636 Not Failing Securely
References
-
github.com
/openclaw/openclaw/security/advisories/GHSA-gp79-m99v-gjmh
vendor-advisory, web, mitigation, advisory
-
vulncheck.com
/advisories/openclaw-missing-channel-type-validation-in-mattermost-event-handlers
third-party-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-53837
advisory
-
github.com
/openclaw/openclaw
package
Sources
- CVE List CVE-2026-53837
- GitHub Advisory GHSA-gp79-m99v-gjmh
- NVD CVE-2026-53837
- Maintainer advisory GHSA-gp79-m99v-gjmh
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
The maintainers of openclaw/openclaw published their own advisory on GitHub. Reviewed sources take precedence over it.