GHSA-56w4-5538-8v8hMediumCVSS 4.3

Synapse Matrix has a partial room state leak via Sliding Sync

Published
December 3, 2024
Last Modified
December 3, 2024

🔗 CVE IDs covered (1)

CVE-2024-53867 →

📋 Description

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.

🎯 Affected products1

  • pip/matrix-synapse:>= 1.113.0rc1, < 1.120.1

🔗 References (4)