CVE-2024-53867: Synapse Matrix has a partial room state leak via Sliding Sync
First published: Tue Dec 03 2024(Updated: )
### 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:security@element.io).
Credit: security-advisories@github.com security-advisories@github.com
| Affected Software | Affected Version | How to fix |
|---|---|---|
| pip/matrix-synapse | >=1.113.0rc1<1.120.1 | 1.120.1 |
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