CVE-2024-53867: PYSEC-2026-1610 - Synapse Matrix has a partial room state leak via Sliding Sync

CVE-2024-53867 · Severity: low · CVSS 3.1 · Published 2026-07-07

Synapse Matrix has a partial room state leak via Sliding Sync

Technologies: matrix-synapse (PyPI). Vendors: PyPI.

Quick answers

Is CVE-2024-53867 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2024-53867 being exploited in the wild.
How severe is CVE-2024-53867?
Low severity, with a CVSS score of 3.1, published 7 July 2026.
Which products and versions are affected?
matrix-synapse (PyPI) ECOSYSTEM:introduced=1.113.0rc1,fixed=1.120.1.
Is there a fix for CVE-2024-53867?
Yes. matrix-synapse (PyPI): upgrade to 1.120.1 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2024-53867?
Check whether you run matrix-synapse (PyPI) at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • matrix-synapse (PyPI): upgrade to 1.120.1 or later
    pip install "matrix-synapse>=1.120.1"

Affected products

  • matrix-synapse (PyPI) ECOSYSTEM:introduced=1.113.0rc1,fixed=1.120.1

Identifiers

  • CVE-2024-53867
  • GHSA-56w4-5538-8v8h
  • PYSEC-2026-1610

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