CVE-2024-52815: Synapse allows a a malformed invite to break the invitee's `/sync`

December 3, 2024 (updated October 31, 2025)

Synapse versions before 1.120.1 fail to properly validate invites received over federation. This vulnerability allows a malicious server to send a specially crafted invite that disrupts the invited user’s /sync functionality.

References

github.com/advisories/GHSA-f3r3-h2mq-hx2h
github.com/element-hq/synapse
github.com/element-hq/synapse/security/advisories/GHSA-f3r3-h2mq-hx2h
nvd.nist.gov/vuln/detail/CVE-2024-52815

Code Behaviors & Features

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