# CVE-2025-59788: Cross-site scripting (XSS) vulnerability in a reachable files_pdfviewer example directory in Nextcloud with versions…

Source: https://junglewise.ai/threats/cve-2025-59788-cross-site-scripting-xss-vulnerability-in-a-reachable-files  
Publisher: Junglewise Threat Intelligence, https://junglewise.ai/threats  
Published: 2025-12-04  
License: CC BY 4.0 with a link back

CVE-2025-59788 · Severity: medium · CVSS 6.4 · Published 2025-12-04

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.

Technologies: [Nextcloud Server](https://junglewise.ai/threats/technologies/nextcloud-server). Vendors: [Nextcloud](https://junglewise.ai/threats/vendors/nextcloud).

## Quick answers

**Is CVE-2025-59788 exploited in the wild?** No. Junglewise Threat Intelligence has no report of CVE-2025-59788 being exploited in the wild.

**How severe is CVE-2025-59788?** Medium severity, with a CVSS score of 6.4, published 4 December 2025.

**Which products and versions are affected?** Nextcloud Server. The advisory does not name versions.

**Is there a fix for CVE-2025-59788?** No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

**Am I affected by CVE-2025-59788?** Check whether you run Nextcloud Server. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

## Affected products

- Nextcloud Server

## Related threats

- [Nextcloud federated share endpoint unauthenticated database write](https://junglewise.ai/threats/cve-2026-77167-abusing-the-federated-share-endpoint-an-attacker-can-write)
- [Nextcloud Server authorization bypass in file comments](https://junglewise.ai/threats/cve-2026-45810-nextcloud-server-authorization-bypass-in-file-comments)
- [Nextcloud Server 2FA bypass in DAV endpoints via session cookie reuse](https://junglewise.ai/threats/cve-2026-45691-nextcloud-server-2fa-bypass-in-dav-endpoints-via-session-cookie)
- [Nextcloud Server 2FA bypass via session token replay](https://junglewise.ai/threats/cve-2026-45690-nextcloud-server-2fa-bypass-via-session-token-replay)
- [Nextcloud Server hidden public link creation in Teams sharing](https://junglewise.ai/threats/cve-2026-45285-nextcloud-server-hidden-public-link-creation-in-teams-sharing)