What is CVE-2024-53863?

CVE-2024-53863 is a critical-severity vulnerability in Element-hq Synapse, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.1/10. Published 2024-12-03.

How severe is CVE-2024-53863?

Critical severity. CVSS v3 base score is 9.1 out of 10.

Arbitrary file upload in Element-hq Synapse

CVE-2024-53863

Synapse is an open-source Matrix homeserver. In Synapse versions before 1.120.1, enabling the dynamic_thumbnails option or processing a specially crafted request could trigger the decoding and thumbnail generation of uncommon image formats…

Vulnerability class: Unrestricted File Upload

EPSS: 0.006 (46.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.

Affected products

Element-hq Synapse — versions < 1.120.1
Matrix Synapse

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)

Frequently asked questions

What is CVE-2024-53863?: CVE-2024-53863 is a critical-severity vulnerability in Element-hq Synapse, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 9.1/10. Published 2024-12-03.
How severe is CVE-2024-53863?: Critical severity. CVSS v3 base score is 9.1 out of 10.