CVE-2024-53867

Synapse Matrix has a partial room state leak via Sliding Sync

Published Dec 3, 2024 CVSS 3.1 · 4.3 Medium EPSS < 1% KEV · Not listed
Description
Synapse is an open-source Matrix homeserver. The Sliding Sync feature on Synapse versions between 1.113.0rc1 and 1.120.0 can leak partial room state changes to users no longer in a room. Non-state events, like messages, are unaffected. This vulnerability is fixed in 1.120.1.

Remediation

No solution or workaround provided in the CVE record

Tracking

Sign in to view the affected projects.

Advisories

Source ID Title
EUVD EUVD EUVD-2024-3430 Synapse is an open-source Matrix homeserver. The Sliding Sync feature on Synapse versions between 1.113.0rc1 and 1.120.0 can leak partial room state changes to users no longer in a room. Non-state events, like messages, are unaffected. This vulnerability is fixed in 1.120.1.
Github GHSA Github GHSA GHSA-56w4-5538-8v8h Synapse Matrix has a partial room state leak via Sliding Sync
History
Type Values Removed Values Added
Metrics epss

{'score': 0.00022}

epss

{'score': 0.00018}

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
Description Synapse is an open-source Matrix homeserver. The Sliding Sync feature on Synapse versions between 1.113.0rc1 and 1.120.0 can leak partial room state changes to users no longer in a room. Non-state events, like messages, are unaffected. This vulnerability is fixed in 1.120.1.
Title Synapse Matrix has a partial room state leak via Sliding Sync
Weaknesses CWE-497
References
Metrics cvssV3_1

{'score': 4.3, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
GitHub_M
Published
Updated
Dec 3, 2024, 7:07 PM
Reserved
Nov 22, 2024, 5:30 PM
Status
Deferred
Published
Dec 3, 2024, 5:15 PM
Modified
Jun 17, 2026, 8:09 AM