PatchTheCVECVE-2024-37303: Synapse is an open-source Matrix homeserver
CVE-2024-37303 is a medium-severity flaw (CVSS 5.3) affecting synapse. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
Synapse is an open-source Matrix homeserver. Synapse before version 1.106 allows, by design, unauthenticated remote participants to trigger a download and caching of remote media from a remote homeserver to the local media repository. Such content then also becomes available for download from the local homeserver in an unauthenticated way. The implication is that unauthenticated remote adversaries can use this functionality to plant problematic c
Why this priority
- Remotely exploitable, no login, no user action
A fixed release or distro patch exists.
Risk facts
| CVSS score | 5.3 (Medium) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | None |
| User interaction | None |
| EPSS exploit chance | 0.4% (top 63%) |
| CISA exploited list | No |
| Weakness | CWE-306 |
| Published | 2024-12-03 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.
Quick answers
How do I fix CVE-2024-37303?
synapse: upgrade to 1.106.0. Exact commands for each OS are on this page.
Is CVE-2024-37303 being exploited?
CVE-2024-37303 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.
What does CVE-2024-37303 affect?
CVE-2024-37303 affects synapse. Severity is medium (CVSS 5.3). Synapse is an open-source Matrix homeserver. Synapse before version 1.106 allows, by design, unauthenticated remote participants to trigger a download and caching of remote media from a remote homeserver to the local media repository. Such
How urgent is CVE-2024-37303?
Priority 33/100. Remotely exploitable, no login, no user action
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