{"action":"Upgrade matrix-synapse to 1.27.0 or later.","affected":[{"fixed":"1.27.0","introduced":"0"}],"component":"matrix-synapse","cve_ids":["CVE-2021-21332"],"ecosystem":"PyPI","epss":0.01221,"exploited":false,"fixed_versions":["1.27.0"],"ghsa_id":"GHSA-246w-56m2-5899","id":"tcs_01M5KERNVGJZ9MM8P1MZXVPXRY","modified_at":"2026-07-08T06:27:41.588536149Z","published_at":"2021-03-26T19:52:54Z","references":["https://osv.dev/vulnerability/GHSA-246w-56m2-5899","https://github.com/matrix-org/synapse/security/advisories/GHSA-246w-56m2-5899","https://nvd.nist.gov/vuln/detail/CVE-2021-21332","https://github.com/matrix-org/synapse/pull/9200","https://github.com/matrix-org/synapse/commit/e54746bdf7d5c831eabe4dcea76a7626f1de73df","https://github.com/matrix-org/synapse","https://github.com/matrix-org/synapse/releases/tag/v1.27.0","https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2021-133.yaml","https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/TNNAJOZNMVMXM6AS7RFFKB4QLUJ4IFEY"],"severity":{"label":"medium","score":6.9},"sources":[{"source":"osv","source_id":"GHSA-246w-56m2-5899","url":"https://osv.dev/vulnerability/GHSA-246w-56m2-5899"}],"summary":"Cross-site scripting (XSS) vulnerability in the password reset endpoint"}