CVE-2024-52815

Synapse allows a a malformed invite to break the invitee's `/sync`

Published: Dec 3, 2024Updated: Aug 26, 2025 Sources: CVE List NVD GHSACWE-20

5.3MEDIUM

Description

Synapse is an open-source Matrix homeserver. 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. Synapse 1.120.1 rejects such invalid invites received over federation and restores the ability to sync for affected users.

No summary for this CVE yet.

CVSS Vector Breakdown

Exploitability

AV:NAttack Vector

Network

AC:LAttack Complexity

Low

PR:NPrivileges Required

None

UI:NUser Interaction

None

Scope

S:UScope

Unchanged

Impact

C:NConfidentiality

None

I:NIntegrity

None

A:LAvailability

Low

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Weaknesses

CWE-20 NVD-CWE-noinfo

Affected Products

element-hq

oss-project

synapseMixed

Communications / messaging-chat

matrix

oss-project·GBaka matrix irc bridge, javascript sdk, synapse

synapseOn-premWeb App

Communications / messaging-chat

PyPI

package-ecosystem

matrix-synapse

OSS Libraries

Exploitability

Official Patch Available

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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

1 technique

Initial Access

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References

https://github.com/element-hq/synapse/security/advisories/GHSA-f3r3-h2mq-hx2h

github.com

https://nvd.nist.gov/vuln/detail/CVE-2024-52815

nvd.nist.gov

https://github.com/element-hq/synapse

github.com

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