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 v3
4.3
EPSS
0.0013
EPSS Percentile
32.6%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
CISA SSVC
Vulnrichment
Exploitation
none
Automatable
no
Technical Impact
partial
Details
CWE
CWE-497
Status
published
Products (2)
element-hq/synapse
>= 1.113.0rc1, < 1.120.1
pypi/matrix-synapse
1.113.0rc1 - 1.120.1PyPI
Published
Dec 03, 2024
Tracked Since
Feb 18, 2026