CVE-2023-42453Low· 3.1▾ Sunlitmatrix-synapse vulnerable to improper validation of receipts allows forged read receipts
▾ Sunlit zone — Low / medium · no exploitation signal
impact 17.1 · likelihood 0.1 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via OSV
Last analysed / modified upstream
0.7%
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.
https://github.com/matrix-org/synapse/pull/16327
There is no workaround.
matrix-synapse >= 0.34.0, < 1.93.0Upgrade to a patched release:
matrix-synapse 1.93.0Connected by shared product, vendor, weakness, or advisory.
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