CVE-2024-53867: Synapse Matrix has a partial room state leak via Sliding Sync

December 3, 2024

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.

References

github.com/advisories/GHSA-56w4-5538-8v8h
github.com/element-hq/synapse
github.com/element-hq/synapse/security/advisories/GHSA-56w4-5538-8v8h
github.com/matrix-org/matrix-spec-proposals/pull/4186
nvd.nist.gov/vuln/detail/CVE-2024-53867

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