Description
The on_get_missing_events function in handlers/federation.py in Matrix Synapse before 0.31.1 has a security bug in the get_missing_events federation API where event visibility rules were not applied correctly.
References (2)
Core 2
Core References
Third Party Advisory x_refsource_confirm
https://github.com/matrix-org/synapse/releases/tag/v0.31.1
Patch, Third Party Advisory x_refsource_confirm
https://github.com/matrix-org/synapse/pull/3371
Scores
CVSS v3
7.5
EPSS
0.0181
EPSS Percentile
76.3%
Attack Vector
NETWORK
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Details
Status
published
Products (2)
matrix/synapse
< 0.31.1
pypi/matrix-synapse
0 - 0.31.1PyPI
Published
Jun 13, 2018
Tracked Since
Feb 18, 2026