CVE-2023-42453

LOW

Synapse >=1.34.0 <1.93.0 - Improper Authorization via Forged Read Receipts

Title source: llm
STIX 2.1

Description

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.

References (6)

Core 6

Scores

CVSS v3 3.1
EPSS 0.0022
EPSS Percentile 45.2%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:N/I:L/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-285
Status published
Products (4)
fedoraproject/fedora 37
fedoraproject/fedora 38
matrix/synapse 1.34.0 - 1.93.0
pypi/matrix-synapse 0.34.0 - 1.93.0PyPI
Published Sep 27, 2023
Tracked Since Feb 18, 2026