CVE-2022-39335CWE-200

Synapse does not apply enough checks to servers requesting auth events of events in a room

Medium · published May 26, 2023

CVSS v3.1
5.0
EPSS
1%
Percentile
49.8
In the wild
Unconfirmed
What it is

Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. The Matrix Federation API allows remote homeservers to request the authorization events in a room. This is necessary so that a homeserver receiving some events can validate that those events are legitimate and permitted in their room. However, in versions of Synapse up to and including 1.68.0, a Synapse homeserver answering a query for authorization events does not sufficiently check that the requesting server should be able to access them. The issue was patched in Synapse 1.69.0. Homeserver administrators are advised to upgrade.

The record
Technical detail
CVSS v3.1
5.0 · MEDIUM
Vector
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:L
CVSS v4.0
Not supplied
EPSS
0.00635 · 49.8th percentile
Weakness
CWE-200 · Exposure of Sensitive Information to an Unauthorized Actor
Published
2023-05-26T13:36Z
EPSS history
Timeline
  • 26 MAY 13:36Z
    Synapse does not apply enough checks to servers requesting auth events of events in a room
    cvelistv5