{"cve":"CVE-2026-53837","nvd":{"published":"2026-06-12T22:16:55.567","modified":"2026-07-23T09:10:00.113","status":"Analyzed","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.","cvss_v4":{"vector":"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","score":6.3},"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","score":5.3},"cwes":["CWE-636"],"references":["https://github.com/openclaw/openclaw/security/advisories/GHSA-gp79-m99v-gjmh","https://www.vulncheck.com/advisories/openclaw-missing-channel-type-validation-in-mattermost-event-handlers"],"products":["openclaw:openclaw"],"source":"nvd","synced_at":"2026-10-19T22:38:48.522727527+00:00"},"epss":{"cve":"CVE-2026-53837","score":0.00189,"percentile":0.08525,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-gp79-m99v-gjmh","url":"https://osv.dev/vulnerability/GHSA-gp79-m99v-gjmh","summary":"OpenClaw: Mattermost handlers could fall open when channel type was missing","modified":"2026-08-28T16:00:07.755038258Z","packages":[{"ecosystem":"npm","name":"openclaw","purl":"pkg:npm/openclaw","ranges":["<2026.5.6"],"fixed":["2026.5.6"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}