🛡️ CVE-2024-53867 — matrix-synapse

🟡 CVSS 4.3 — Medium ✅ No Known Exploit CWE-497 NVD
4.3
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Synapse Matrix has a partial room state leak via Sliding Sync

Impact

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.

Patches

Synapse version 1.120.1 fixes the problem.

Workarounds

Disable Sliding Sync.

References

https://github.com/matrix-org/matrix-spec-proposals/pull/4186

https://github.com/element-hq/synapse/blob/d80cd57c54427687afcb48740d99219c88a0fff1/synapse/config/experimental.py#L341-L344

For more information

If you have any questions or comments about this advisory, please email us at [security at element.io](mailto:[email protected]).

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality low, integrity none, availability none.

Weakness class

CVE-2024-53867 is classified as CWE-497: Exposure of System Data to Unauthorized Control Sphere. Internal system details are revealed to callers who should not have them.

Affected software

CVE-2024-53867 is recorded against 2 packages.

  • matrix-synapse (from 1.113.0rc1 up to 1.120.1)
  • unknown

Timeline and source

Published on 3 December 2024 and last revised on 7 July 2026. No public exploit is currently recorded for this entry. Record sourced from NVD.

References

github.com (Web)
nvd.nist.gov (Advisory)
github.com (Web)
github.com (Package)

CVE-2024-53867 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 4.3
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CWE CWE-497
Public Exploit ✅ No
Source NVD
Published 2024-12-03
Updated 2026-08-12
Modified 2026-07-07
Fix URL N/A

Affected Packages

Software From version Fixed in
matrix-synapse 1.113.0rc1 1.120.1
unknown — —

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