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Vulnerability · Published Dec 4, 2025 · Assigned by mitre

CVE-2025-59788

Medium 6.4

In plain English

A medium-severity security flaw in Nextcloud from Nextcloud. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 26% of all known vulnerabilities).

Severity (CVSS 3.1)6.4Medium
Exploit odds (30 days)0.3%top 74.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known

Official 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.

Affected products (as reported)

VendorProductVersions
Nextcloud Nextcloud 0 – before 22.2.10.3323 – before 23.0.12.2924 – before 24.0.12.2825 – before 25.0.13.2326 – before 26.0.13.2027 – before 27.1.11.2028 – before 28.0.14.1129 – before 29.0.16.8

Weakness: CWE-749 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

References