CVSS 3.1
6.5 mediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HCVE-2022-39374
Medium (6.5) in matrix synapse. EPSS 0.9% chance of exploitation in the next 30 days. Fixed in matrix-synapse 1.68.0, 1.68.0rc1.
Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. If Synapse and a malicious homeserver are both joined to the same room, the malicious homeserver can trick Synapse into accepting previously rejected events into its view of the current state of that room. This can be exploited in a way that causes all further messages and state changes sent in that room from the vulnerable homeserver to be rejected. This issue has been patched in version 1.68.0
Severity
- EPSS
- 0.9% chance of exploitation in the next 30 days; higher than 60% of CVEs (scores of 2026-10-31)
- CWE
- CWE-400
- Published
- Modified
- Record from
- the NVD, synced
Affected
- matrix:synapse
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-p9qp-c452-f9r7 | PyPI | matrix-synapse | >=1.62.0 <1.68.0rc1 | 1.68.0rc1 |
| PYSEC-2023-66 | PyPI | matrix-synapse | >=1.62.0 <1.68.0 | 1.68.0 |
References
- https://github.com/matrix-org/synapse/pull/13723
- https://github.com/matrix-org/synapse/security/advisories/GHSA-p9qp-c452-f9r7
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/UJIJRP5ZH6B3KGFLHCAKR2IX2Y4Z25QD/
- https://github.com/matrix-org/synapse/pull/13723
- https://github.com/matrix-org/synapse/security/advisories/GHSA-p9qp-c452-f9r7