NetSight
IP …
medium3.1

CVE-2023-42453

matrix-synapse vulnerable to improper validation of receipts allows forged read receipts

Impact

### Impact 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. ### Patches https://github.com/matrix-org/synapse/pull/16327 ### Workarounds There is no workaround.

Affected packages

EcosystemPackageAffectedFixed in
pipmatrix-synapse>= 0.34.0, < 1.93.01.93.0

Affected products

VendorProductAffected versions
MatrixSynapse
from 1.34.0 before 1.93.0
FedoraprojectFedora
Versions 37, 38

Weakness classification

CWE-285

References