CVE-2024-52514: Nextcloud Server allows users to copy folder that contain files that are blocked by the files access control

Severity: low (CVSS 3.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.5% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-11-15 · updated 2026-06-17
Weakness: CWE-284

Description

Nextcloud Server is a self hosted personal cloud system. After a user received a share with some files inside being blocked by the files access control, the user would still be able to copy the intermediate folder inside Nextcloud allowing them to afterwards potentially access the blocked files depending on the user access control rules. It is recommended that the Nextcloud Server is upgraded to 27.1.9, 28.0.5 or 29.0.0 and Nextcloud Enterprise Server is upgraded to 21.0.9.18, 22.2.10.23, 23.0.12.18, 24.0.12.14, 25.0.13.9, 26.0.13.3, 27.1.9, 28.0.5 or 29.0.0.

Affected products

Nextcloud Server: from 21.0.0 before 21.0.9.18; from 22.0.0 before 22.2.10.23; from 23.0.0 before 23.0.12.18; from 24.0.0 before 24.0.12.14; from 25.0.0 before 25.0.13.9; from 26.0.0 before 26.0.13.3 — fixed in 21.0.9.18, 22.2.10.23, 23.0.12.18, 24.0.12.14, 25.0.13.9, 26.0.13.3

How to fix

Upgrade to a fixed version: Nextcloud Server 21.0.9.18, 22.2.10.23, 23.0.12.18, 24.0.12.14. Check the vendor advisory for mitigations.

References

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