CVE-2025-59788: Cross-site scripting (XSS) vulnerability in a reachable files_pdfviewer example directory in Nextcloud with versions before 22.2.10.33, 23.0.12.29, 24.0.12.28, 25.0.13.23,…

Medium severity · published Dec 4, 2025

CVE-2025-59788

Cross-site scripting (XSS) vulnerability in a reachable files_pdfviewer example directory in Nextcloud with versions before 22.2.10.33, 23.0.12.29, 24.0.12.28, 25.0.13.23,…

5.4

CVSS

0.3%

EPSS

On KEV

Description

Cross-site scripting (XSS) vulnerability in a reachable files_pdfviewer example directory in Nextcloud with versions before 22.2.10.33, 23.0.12.29, 24.0.12.28, 25.0.13.23, 26.0.13.20, 27.1.11.20, 28.0.14.11, 29.0.16.8, 30.0.17, 31.0.10, and 32.0.1 allows attackers to execute arbitrary JavaScript in the context of a user's browser via a crafted PDF file to viewer.html. This issue is related to CVE-2024-4367, but the root cause of this Nextcloud issue is that the product exposes executable example code on a same-origin basis.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Attack vector

Network

Complexity

Low

Privileges

Low

User interaction

Required

Confidentiality

Low

Integrity

Low

Availability

None

Scope

Changed

Exploitation

Is it being used?

Exploit prediction (EPSS)0.3% · higher than 23% of CVEs

Exploited in the wildNo evidence yet

CISA KEVNot listed

Ransomware campaign useNot known

Affected products

Which versions

Nextcloud Server · Nextcloud

30.0.0 before 30.0.17; 31.0.0 before 31.0.10; 32.0.0 before 32.0.1; 22.0.0 before 22.2.10.33; 23.0.0 before 23.0.12.29; 24.0.0 before 24.0.12.28; +8 more · source: NVD

Affected product

Nextcloud Server

Nextcloud

All Nextcloud Server CVEs

References

NVD

https://nvd.nist.gov/vuln/detail/CVE-2025-59788

CVE.org

https://www.cve.org/CVERecord?id=CVE-2025-59788

Mitigation

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-24wp-p865-7j4r

Product

https://nextcloud.com

Exploit

https://www.redteam-pentesting.de/en/advisories/rt-sa-2025-003/