What is CVE-2024-52520?

CVE-2024-52520 is a medium-severity vulnerability in Nextcloud Server, classified under Uncontrolled Resource Consumption. CVSS score: 5.7/10. Published 2024-11-15.

How severe is CVE-2024-52520?

Medium severity. CVSS v3 base score is 5.7 out of 10.

XSS in Nextcloud Server

CVE-2024-52520

Nextcloud Server is a self hosted personal cloud system. Due to a pre-flighted HEAD request, the link reference provider could be tricked into downloading bigger websites than intended, to find open-graph data. It is recommended that the Nextcloud Server is upgraded to 28.0.10 or 29.0.7 and Nextcloud Enterprise Server is upgraded to 27.1.11.8, 28.0.10 or 29.0.7.

Vulnerability class: DoS (Denial of Service)

Published 2024-11-15 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.7 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.008 (54.6th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Nextcloud Server
Nextcloud Security-Advisories — versions >= 28.0.0, < 28.0.10, >= 29.0.0, < 29.0.7

Weakness classification (CWE)

References

github.com/nextcloud/security-advisories/security/advisories/GHSA-pxqf-cfxw-mqmj (Vendor Advisory)
github.com/nextcloud/server/pull/47627 (Patch)
github.com/nextcloud/server/commit/873c42b0f1383d5b6f2b7a481e1d9620ed30f44a (Patch)

Frequently asked questions

What is CVE-2024-52520?: CVE-2024-52520 is a medium-severity vulnerability in Nextcloud Server, classified under Uncontrolled Resource Consumption. CVSS score: 5.7/10. Published 2024-11-15.
How severe is CVE-2024-52520?: Medium severity. CVSS v3 base score is 5.7 out of 10.