CVE-2024-37303

MEDIUM

5.3

Description

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 content into the media repository. Synapse 1.106 introduces a partial mitigation in the form of new endpoints which require authentication for media downloads. The unauthenticated endpoints will be frozen in a future release, closing the attack vector.

CVE Details

CVSS v3.1 Score5.3

SeverityMEDIUM

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published12/3/2024

Last Modified8/26/2025

Sourcenvd

Honeypot Sightings0

Affected Products

matrix:synapse

Weaknesses (CWE)

CWE-306

References

https://github.com/element-hq/synapse/security/advisories/GHSA-gjgr-7834-rhxr(security-advisories@github.com)

https://github.com/matrix-org/matrix-spec-proposals/pull/3916(security-advisories@github.com)

IOC Correlations

No correlations recorded

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