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Vulnerability · Published Dec 3, 2024 · Assigned by GitHub_M

CVE-2024-53867Synapse Matrix has a partial room state leak via Sliding Sync

Medium 4.3

In plain English

A medium-severity security flaw in synapse from element-hq. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 39% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.4%top 61.4% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official 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.

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
Alpine:v3.20synapse1.120.1ALPINE-CVE-2024-53867
Alpine:v3.21synapse1.120.2-r0ALPINE-CVE-2024-53867
Alpine:v3.22synapse1.120.2-r0ALPINE-CVE-2024-53867
Alpine:v3.23synapse1.120.2-r0ALPINE-CVE-2024-53867
Alpine:v3.24synapse1.120.2-r0ALPINE-CVE-2024-53867
Debian:14matrix-synapse1.121.0-1DEBIAN-CVE-2024-53867
PyPImatrix-synapse1.120.1GHSA-56w4-5538-8v8h
PyPImatrix-synapse1.120.1PYSEC-2026-1610
Ubuntu:22.04:LTSmatrix-synapse1.53.0-1UBUNTU-CVE-2024-53867
Ubuntu:24.04:LTSmatrix-synapse1.100.0-1ubuntu1UBUNTU-CVE-2024-53867

Affected products (as reported)

VendorProductVersions
element-hq synapse >= 1.113.0rc1, < 1.120.1

Weakness: CWE-497 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

References