Homepage

Improper Authorization The advisory has been revoked - it doesn't affect any version of package matrix-synapse  (opens in a new tab)

Threat Intelligence

EPSS
0.65% (47th percentile)

Do your applications use this vulnerable package?

In a few clicks we can analyze your entire application and see what components are vulnerable in your application, and suggest you quick fixes.

Test your applications
  • Snyk IDSNYK-UBUNTU2004-MATRIXSYNAPSE-5927384
  • published8 Apr 2025
  • disclosed27 Sept 2023
Report a new vulnerability Found a mistake?

Introduced: 27 Sep 2023

CVE-2023-42453  (opens in a new tab)
CWE-285  (opens in a new tab)

Amendment

The Ubuntu security team deemed this advisory irrelevant for Ubuntu:20.04.

NVD Description

Note: Versions mentioned in the description apply only to the upstream matrix-synapse package and not the matrix-synapse package as distributed by Ubuntu.

Synapse is an open-source Matrix homeserver written and maintained by the Matrix.org Foundation. Users were able to forge read receipts for any event (if they knew the room ID and event ID). Note that the users were not able to view the events, but simply mark it as read. This could be confusing as clients will show the event as read by the user, even if they are not in the room. This issue has been patched in version 1.93.0. Users are advised to upgrade. There are no known workarounds for this issue.