CVE-2024-52815

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

Published Dec 3, 2024 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

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
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'}

Type Values Removed Values Added
Metrics epss

{'score': 0.00064}

epss

{'score': 0.00053}

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'}

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`
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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Dec 3, 2024, 7:06 PM
Reserved
Nov 15, 2024, 5:11 PM
Status
Analyzed
Published
Dec 3, 2024, 5:15 PM
Modified
Jun 17, 2026, 8:07 AM