What is CVE-2024-52518?

CVE-2024-52518 is a medium-severity vulnerability in Nextcloud Server, classified under Improper Authentication. CVSS score: 4.4/10. Published 2024-11-15.

How severe is CVE-2024-52518?

Medium severity. CVSS v3 base score is 4.4 out of 10.

Auth bypass in Nextcloud Server

CVE-2024-52518

Nextcloud Server is a self hosted personal cloud system. After an attacker got access to the session of a user or administrator, the attacker would be able to create, change or delete external storages without having to confirm the password. It is recommended that the Nextcloud Server is upgraded to 28.0.12, 29.0.9 or 30.0.2.

Vulnerability class: Broken Authentication

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

CVSS v3 metric

CVSS v3 base score 4.4 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.005 (43.1th percentile), scored 2026-10-01.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 43.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: 0.000

Affected products

Nextcloud Server
Nextcloud Security-Advisories — versions >= 28.0.0, < 28.0.12, >= 29.0.0, < 29.0.9, >= 30.0.0, < 30.0.2

Weakness classification (CWE)

References

github.com/nextcloud/security-advisories/security/advisories/GHSA-vrhf-532w-99rg (Vendor Advisory)
github.com/nextcloud/server/pull/48373 (Issue Tracking)
github.com/nextcloud/server/pull/48788 (Issue Tracking)
github.com/nextcloud/server/pull/48992 (Issue Tracking)
hackerone.com/reports/2602973 (Permissions Required)

Frequently asked questions

What is CVE-2024-52518?: CVE-2024-52518 is a medium-severity vulnerability in Nextcloud Server, classified under Improper Authentication. CVSS score: 4.4/10. Published 2024-11-15.
How severe is CVE-2024-52518?: Medium severity. CVSS v3 base score is 4.4 out of 10.