CVE-2024-53867

Synapse Matrix has a partial room state leak via Sliding Sync

State: Published
Severity: 4.3 Medium
Published: Dec 3, 2024
Updated: Dec 3, 2024
Reserved: Nov 22, 2024

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.

Scores

CVSS	Score	Vector	Source
3.1	4.3 Medium	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N	GitHub_M

Weaknesses

CWE-497 Exposure of Sensitive System Information to an Unauthorized Control Sphere

Affected Products

Product	Versions
synapseelement-hq	>= 1.113.0rc1, < 1.120.1Affected

References

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

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