CVE-2024-53867

Synapse Matrix has a partial room state leak via Sliding Sync

CVSS 4.3 MEDIUMEPSS 0.4%CWE-497

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:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Affected products

element-hq · synapse

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References

https://github.com/element-hq/synapse/security/advisories/GHSA-56w4-5538-8v8h https://github.com/matrix-org/matrix-spec-proposals/pull/4186