What is CVE-2024-53867?

CVE-2024-53867 is a medium-severity vulnerability in Element-hq Synapse, classified under Exposure of Sensitive System Information to an Unauthorized Control Sphere. CVSS score: 4.3/10. Published 2024-12-03.

How severe is CVE-2024-53867?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Vulnerability in Element-hq Synapse

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. Thi…

EPSS: 0.001 (32.5th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

Affected products

Element-hq Synapse — versions >= 1.113.0rc1, < 1.120.1

Weakness classification (CWE)

CWE-497 — Exposure of Sensitive System Information to an Unauthorized Control Sphere

References

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

Frequently asked questions

What is CVE-2024-53867?: CVE-2024-53867 is a medium-severity vulnerability in Element-hq Synapse, classified under Exposure of Sensitive System Information to an Unauthorized Control Sphere. CVSS score: 4.3/10. Published 2024-12-03.
How severe is CVE-2024-53867?: Medium severity. CVSS v3 base score is 4.3 out of 10.