{"action":"Upgrade matrix-synapse to 1.93.0 or later.","affected":[{"fixed":"1.93.0","introduced":"0.34.0"}],"component":"matrix-synapse","cve_ids":["CVE-2023-42453"],"ecosystem":"PyPI","epss":0.00777,"exploited":false,"fixed_versions":["1.93.0"],"ghsa_id":"GHSA-7565-cq32-vx2x","id":"tcs_01M5KF4XYTSQ9ZWGEDY3C74NCA","modified_at":"2026-09-10T03:49:57.892935878Z","published_at":"2023-09-26T19:20:38Z","references":["https://osv.dev/vulnerability/GHSA-7565-cq32-vx2x","https://github.com/matrix-org/synapse/security/advisories/GHSA-7565-cq32-vx2x","https://nvd.nist.gov/vuln/detail/CVE-2023-42453","https://github.com/matrix-org/synapse/pull/16327","https://github.com/matrix-org/synapse/commit/63d28a88c1d18c64ea7e23b6dd7483e6d5dcf881","https://github.com/matrix-org/synapse","https://github.com/pypa/advisory-database/tree/main/vulns/matrix-synapse/PYSEC-2023-180.yaml","https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2AFB2Y3S2VCPCN5P2XCZTG24MBMZ7DM4","https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/65QPC55I4D27HIZP7H2NQ34EOXHPP4AO","https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/N6P4QULVUE254WI7XF2LWWOGHCYVFXFY","https://security.gentoo.org/glsa/202401-12"],"severity":{"label":"low","score":3.1},"sources":[{"source":"osv","source_id":"GHSA-7565-cq32-vx2x","url":"https://osv.dev/vulnerability/GHSA-7565-cq32-vx2x"}],"summary":"matrix-synapse vulnerable to improper validation of receipts allows forged read receipts"}