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Nextcloud CVE-2025-59788

| EUVDEUVD-2025-201255 MEDIUM
Exposed Dangerous Method or Function (CWE-749)
2025-12-04 cve@mitre.org
XSS Nextcloud
6.4
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
6.4 MEDIUM
AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None

Lifecycle Timeline

4
Patch available
Apr 16, 2026 - 05:29 EUVD
30.0.17,25.0.13.23,22.2.10.33
EUVD ID Assigned
Mar 15, 2026 - 16:35 euvd
EUVD-2025-201255
Analysis Generated
Mar 15, 2026 - 16:35 vuln.today
CVE Published
Dec 04, 2025 - 19:16 nvd
MEDIUM 6.4

DescriptionCVE.org

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.

AnalysisAI

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...

Technical ContextAI

Cross-site scripting (XSS) allows injection of client-side scripts into web pages viewed by other users due to insufficient output encoding. This vulnerability is classified as Exposed Dangerous Method or Function (CWE-749).

RemediationAI

Encode all user-supplied output contextually (HTML, JS, URL). Implement Content Security Policy (CSP) headers. Use HTTPOnly and Secure cookie flags.

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Vendor StatusVendor

Debian

Bug #941708
nextcloud-server
Release Status Fixed Version Urgency
open - -

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CVE-2025-59788 vulnerability details – vuln.today
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