{"id":"CVE-2026-100541","url":"https://www.cyber-defence.io/tools/cve/CVE-2026-100541","generatedAt":"2026-10-28T00:57:04.748Z","title":"A Matrix participant controlling a colliding account identifier (a protocol-valid identifier that differs from the configured one only by characters OpenClaw case/Unicode folds; display-name matching is not required) can inherit allowlist,…","description":"OpenClaw's Matrix integration (npm package @openclaw/matrix) versions >= 2026.2.2 and < 2026.8.1 lowercase complete Matrix user IDs — including historical localparts and the case-sensitive server-name portion — when deriving the OpenClaw authorization identity. As a result, distinct authenticated Matrix accounts can normalize to the same authorization identity. A Matrix participant controlling a colliding account identifier (a protocol-valid identifier that differs from the configured one only by characters OpenClaw case/Unicode folds; display-name matching is not required) can inherit allowlist, owner-command, exec-approval, or plugin-approval authority configured for another account. The issue is fixed in 2026.8.1.","published":"2026-09-26T03:17:00.000Z","lastModified":"2026-10-08T16:16:56.000Z","status":"Deferred","sourceIdentifier":"disclosure@vulncheck.com","cvss":{"version":"4.0","score":7.7,"severity":"HIGH","vector":"CVSS:4.0/AV:N/AC:H/AT:P/PR:L/UI:N/VC:H/VI:H/VA:H/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/M"},"cwe":["CWE-178"],"affected":[],"epss":{"score":0.00303,"percentile":0.22849,"date":"2026-10-26","history":[{"date":"2026-09-26","score":0.00303,"percentile":0.20653}]},"kev":{"listed":false},"exploits":{"count":0,"verified":false,"firstPublished":null,"source":"Exploit-DB (https://gitlab.com/exploit-database/exploitdb)","entries":[]},"verdict":{"level":"high","text":"High impact if exploited, but EPSS currently rates exploitation as unlikely (0.30%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit."},"changes":[{"kind":"new","label":"New CVE","at":"2026-09-26T03:17:00.000Z","detail":{"score":"7.7","severity":"HIGH","publishedAt":"2026-09-26T03:16:59.987Z"},"summary":"New CVE, high severity (CVSS 7.7)."}],"references":[{"url":"https://github.com/openclaw/openclaw/security/advisories/GHSA-hgv5-f2r3-6v9r","source":"disclosure@vulncheck.com"},{"url":"https://www.vulncheck.com/advisories/openclaw-matrix-before-2026.8.1-authorization-bypass-via-case-folding","source":"disclosure@vulncheck.com"}],"sources":{"nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-100541","epss":"https://www.first.org/epss/","kev":"https://www.cisa.gov/known-exploited-vulnerabilities-catalog","exploitdb":"https://www.exploit-db.com/"},"licence":"CC BY 4.0 — link back to the CVE Explorer if you publish the results; upstream data remains subject to its own terms."}