{"cve":"CVE-2024-53867","nvd":{"published":"2024-12-03T17:15:12.787","modified":"2026-06-17T08:09:26.593","status":"Deferred","description":"Synapse is an open-source Matrix homeserver. The Sliding Sync feature on Synapse versions between 1.113.0rc1 and 1.120.0 can leak partial room state changes to users no longer in a room. Non-state events, like messages, are unaffected. This vulnerability is fixed in 1.120.1.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N","score":4.3},"cwes":["CWE-497"],"references":["https://github.com/element-hq/synapse/security/advisories/GHSA-56w4-5538-8v8h","https://github.com/matrix-org/matrix-spec-proposals/pull/4186"],"products":[],"source":"nvd","synced_at":"2026-10-19T21:57:36.180738747+00:00"},"epss":{"cve":"CVE-2024-53867","score":0.00442,"percentile":0.38465,"date":"2026-10-31"},"kev":null,"osv":[{"id":"GHSA-56w4-5538-8v8h","url":"https://osv.dev/vulnerability/GHSA-56w4-5538-8v8h","summary":"Synapse Matrix has a partial room state leak via Sliding Sync","modified":"2026-07-07T17:57:08.952627015Z","packages":[{"ecosystem":"PyPI","name":"matrix-synapse","purl":"pkg:pypi/matrix-synapse","ranges":[">=1.113.0rc1 <1.120.1"],"fixed":["1.120.1"]}]},{"id":"PYSEC-2026-1610","url":"https://osv.dev/vulnerability/PYSEC-2026-1610","summary":"Synapse Matrix has a partial room state leak via Sliding Sync","modified":"2026-07-07T17:47:03.468918922Z","packages":[{"ecosystem":"PyPI","name":"matrix-synapse","purl":"pkg:pypi/matrix-synapse","ranges":[">=1.113.0rc1 <1.120.1"],"fixed":["1.120.1"]}]}],"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."]}