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.
Published: 2024-12-03
Score: 8.7 High
EPSS: < 1% Very Low
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

No vendor fix or workaround currently provided.

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Tracking

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Advisories
Source ID Title
EUVD EUVD EUVD-2024-3463 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.
Github GHSA Github GHSA GHSA-f3r3-h2mq-hx2h Synapse allows a a malformed invite to break the invitee's `/sync`
History

Tue, 26 Aug 2025 15:15:00 +0000

Type Values Removed Values Added
First Time appeared Matrix
Matrix synapse
Weaknesses NVD-CWE-noinfo
CPEs cpe:2.3:a:matrix:synapse:*:*:*:*:*:*:*:*
Vendors & Products Matrix
Matrix synapse
Metrics cvssV3_1

{'score': 5.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L'}

Wed, 16 Jul 2025 13:45:00 +0000

Type Values Removed Values Added
Metrics epss

{'score': 0.00064}

 epss

{'score': 0.00053}

Tue, 03 Dec 2024 19:15:00 +0000

Type Values Removed Values Added
First Time appeared Element-hq
Element-hq synapse
CPEs cpe:2.3:a:element-hq:synapse:*:*:*:*:*:*:*:*
Vendors & Products Element-hq
Element-hq synapse
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 03 Dec 2024 17:15:00 +0000

Type Values Removed Values Added
Title A malformed invite can break the invitee's `/sync` Synapse allows a a malformed invite to break the invitee's `/sync`

Tue, 03 Dec 2024 17:00:00 +0000

Type Values Removed Values Added
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.
Title A malformed invite can break the invitee's `/sync`
Weaknesses CWE-20
References
Metrics cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}

Subscriptions

Element-hq Synapse
Matrix Synapse
cve-icon MITRE

Status: PUBLISHED

Assigner: GitHub_M

Published:

Updated: 2024-12-03T19:06:11.082Z

Reserved: 2024-11-15T17:11:13.444Z

Link: CVE-2024-52815

cve-icon Vulnrichment

Updated: 2024-12-03T19:06:00.818Z

cve-icon NVD

Status : Analyzed

Published: 2024-12-03T17:15:12.267

Modified: 2025-08-26T15:02:27.547

Link: CVE-2024-52815

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses