CVE-2024-53867 (CVSS 4.3)

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.

Is your site exposed to CVE-2024-53867?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

4.3

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Weakness Type (CWE)

CWE-497 CWE-497

References

Other References

https://github.com/element-hq/synapse/security/advisories/GHSA-56w4-5538-8v8h https://github.com/matrix-org/matrix-spec-proposals/pull/4186

Frequently Asked Questions

What is CVE-2024-53867? +

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. It has a CVSS v3.1 base score of 4.3 (MEDIUM).

How severe is CVE-2024-53867? +

CVE-2024-53867 has a CVSS v3.1 score of 4.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

How do I check if I'm vulnerable to CVE-2024-53867? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2025-15623

Exposure of Private Personal Information to an Unauthorized Actor, : Exposure of Sensitive System Information to an Unauthorized Control Sphere …

CVE-2026-9307

A sensitive information disclosure security issue exists within the affected CompactLogix controllers. The controller's web server exposes CIP Connection IDs …

CVE-2024-8313

An Exposure of Sensitive System Information to an Unauthorized Control Sphere and Initialization of a Resource with an Insecure Default …

CVE-2025-32792

SES safely executes third-party JavaScript 'strict' mode programs in compartments that have no excess authority in their global scope. Prior …

CVE-2025-4364

The affected products could allow an unauthenticated attacker to access system information that could enable further access to sensitive files …

CVE-2025-2236

Exposure of Sensitive System Information to an Unauthorized Control Sphere vulnerability in OpenText Advanced Authentication allows Information Elicitation. The vulnerability …

CVE-2024-53867