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.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| matrix-org | synapse | >= 0.34.0, < 1.93.0 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 22.04 LTS | matrix-synapse | 1.53.0-1ubuntu0.1~esm2 | USN-7444-1 |
| Ubuntu Pro 20.04 LTS | matrix-synapse | 1.11.0-1ubuntu0.1~esm2 | USN-7444-1 |
| Ubuntu Pro 18.04 LTS | matrix-synapse | 0.24.0+dfsg-1ubuntu0.1~esm4 | USN-7444-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | matrix-synapse | 1.93.0-1.1 | openSUSE-SU-2024:13270-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | synapse | 1.93.0-r0 | — |
| Alpine v3.23 | synapse | 1.93.0-r0 | — |
| Alpine v3.22 | synapse | 1.93.0-r0 | — |
| Alpine v3.21 | synapse | 1.93.0-r0 | — |
| Alpine v3.20 | synapse | 1.93.0-r0 | — |
Show 2 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | synapse | 1.93.0-r0 | — |
| Alpine v3.18 | synapse | 1.93.0-r0 | — |
Affected packages
| Ecosystem | Package | Affected | Fixed | Record |
|---|---|---|---|---|
| PyPI | matrix-synapse | >= 0.34.0, < 1.93.0 | 1.93.0 | GHSA-7565-cq32-vx2x |
| PyPI | matrix-synapse | >= 1.34.0, < 1.93.0 | 1.93.0 | PYSEC-2023-180 |
Advisories 2
- USN-7444-1 matrix-synapse vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- openSUSE-SU-2024:13270-1 matrix-synapse-1.93.0-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
References
- https://github.com/matrix-org/synapse/security/advisories/GHSA-7565-cq32-vx2x
- https://github.com/matrix-org/synapse/pull/16327
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/65QPC55I4D27HIZP7H2NQ34EOXHPP4AO/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/2AFB2Y3S2VCPCN5P2XCZTG24MBMZ7DM4/
- https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/N6P4QULVUE254WI7XF2LWWOGHCYVFXFY/
- https://security.gentoo.org/glsa/202401-12