GHSA-56w4-5538-8v8h
Synapse Matrix has a partial room state leak via Sliding Sync
Packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| PyPI | matrix-synapse | >= 1.113.0rc1, < 1.120.1 | 1.120.1 |
Details
As written in the advisory (Markdown source, shown as plain text).
### 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]).
References
External links from the advisory. They lead to third-party sites.