What is CVE-2023-25159?

CVE-2023-25159 is a low-severity vulnerability in Nextcloud Server, classified under Improper Access Control. CVSS score: 2.3/10. Published 2023-02-13.

How severe is CVE-2023-25159?

Low severity. CVSS v3 base score is 2.3 out of 10.

Vulnerability in Nextcloud Server

CVE-2023-25159

Nextcloud Server is the file server software for Nextcloud, a self-hosted productivity platform, and Nextcloud Office is a document collaboration app for the same platform. Nextcloud Server 24.0.x prior to 24.0.8 and 25.0.x prior to 25.0.1, Nextcloud Enterprise Server 24.0.x prior to 24.0.8 and 25.0.x prior to 25.0.1, and Nextcloud Office (Richdocuments) App 6.x prior to 6.3.1 and 7.x prior to 7.0.1 have previews accessible without a watermark. The download should be hidden and the watermark should get applied. This issue is fixed in Nextcloud Server 25.0.1 and 24.0.8, Nextcloud Enterprise Server 25.0.1 and 24.0.8, and Nextcloud Office (Richdocuments) App 7.0.1 (for 25) and 6.3.1 (for 24). No known workarounds are available.

Published 2023-02-13 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 2.3 (Low). Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.005 (37.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 37th percentile — 37.0% 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 — versions 24.0.2, 25.0.0
Nextcloud Richdocuments — versions 7.0.0
Nextcloud Security-Advisories — versions >= 24.0.4, < 24.0.8, = 25.0.0, >= 6.0.0, < 6.3.1

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

github.com/nextcloud/security-advisories/security/advisories/GHSA-92g2-h5jv-jjmg (Vendor Advisory)
github.com/nextcloud/richdocuments/pull/2579 (Broken Link)
github.com/nextcloud/server/pull/34799 (Broken Link)
hackerone.com/reports/1745755 (Permissions Required, Third Party Advisory)

Frequently asked questions

What is CVE-2023-25159?: CVE-2023-25159 is a low-severity vulnerability in Nextcloud Server, classified under Improper Access Control. CVSS score: 2.3/10. Published 2023-02-13.
How severe is CVE-2023-25159?: Low severity. CVSS v3 base score is 2.3 out of 10.