CVE-2026-45810: Nextcloud: Propfind requests for file comments allowed to load comments for other files

Severity: medium (CVSS 6.8 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-06-01 · updated 2026-07-22
Weakness: CWE-639

Description

Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 31.0.0 to before 31.0.12, and 32.0.0 to before 32.0.3, a missing check of a relation allowed authenticated users with access to any file comment, to read the content of all comments. It is recommended that the Nextcloud Server is upgraded to 31.0.12 or 32.0.3. It is recommended that the Nextcloud Enterprise Server is upgraded to 21.0.9.20, 22.2.10.35, 23.0.12.31, 24.0.12.30, 25.0.13.25, 26.0.13.22, 27.1.11.22, 28.0.14.13, 29.0.16.10, 30.0.17.5, 31.0.12 or 32.0.3

Affected products

Nextcloud Server: from 31.0.0 before 31.0.12; from 32.0.0 before 32.0.3; from 21.0.0 before 21.0.9.20; from 22.0.0 before 22.2.10.35; from 23.0.0 before 23.0.12.31; from 24.0.0 before 24.0.12.30 — fixed in 21.0.9.20, 22.2.10.35, 23.0.12.31, 24.0.12.30, 25.0.13.25, 26.0.13.22

How to fix

Upgrade to a fixed version: Nextcloud Server 21.0.9.20, 22.2.10.35, 23.0.12.31, 24.0.12.30. Check the vendor advisory for mitigations.

References

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