CVE-2023-42453
Low
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.
SeverityLow
CVSS3.1
Exploit probability—
Product
Matrix Synapse
PublishedSep 27, 2023
First seenSep 27, 2023
Weakness typeCWE-285CWE-285
How to fix
Update
- matrix synapse1.93.0 or later
- matrix-synapse1.93.0 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| matrix synapse | 1.34.0 ≤ v < 1.93.0 | 1.93.0 |
| fedoraproject fedora | 37, 38 | — |
| matrix-synapsePyPI | 0.34.0 ≤ v < 1.93.0, 1.34.0 ≤ v < 1.93.0 | 1.93.0 |
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