{"action":"Upgrade matrix-appservice-bridge to 8.1.2 or later.","affected":[{"fixed":"8.1.2","introduced":"4.0.0"},{"fixed":"9.0.1","introduced":"9.0.0"}],"component":"matrix-appservice-bridge","cve_ids":["CVE-2023-38691"],"ecosystem":"npm","epss":0.00466,"exploited":false,"fixed_versions":["8.1.2","9.0.1"],"ghsa_id":"GHSA-vc7j-h8xg-fv5x","id":"tcs_01M5KGBGDMH8CBMMREMHWJ7BT1","modified_at":"2026-09-10T03:49:57.718797886Z","published_at":"2023-08-04T17:26:32Z","references":["https://osv.dev/vulnerability/GHSA-vc7j-h8xg-fv5x","https://github.com/matrix-org/matrix-appservice-bridge/security/advisories/GHSA-vc7j-h8xg-fv5x","https://nvd.nist.gov/vuln/detail/CVE-2023-38691","https://github.com/matrix-org/matrix-appservice-bridge/commit/4c6723a5e7beda65cdf1ae5dbb882e8beaac8552","https://github.com/matrix-org/matrix-appservice-bridge"],"severity":{"label":"medium","score":5},"sources":[{"source":"osv","source_id":"GHSA-vc7j-h8xg-fv5x","url":"https://osv.dev/vulnerability/GHSA-vc7j-h8xg-fv5x"}],"summary":"matrix-appservice-bridge doesn't verify the sub parameter of an openId token exhange, allowing unauthorized access to provisioning APIs"}