CVE-2025-66512
Last modified
CVE-2025-66512 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Server Enterprise prior to 31.0.12 and 32.0.3, a missing sanitization allowed malicious users to circumvent the content security policy when a malicious user manages to trick a user it viewing an uploaded SVG outside of the Nextcloud Servers web page.. EPSS estimates a 0.23% chance of exploitation in the next 30 days.
Description
Nextcloud Server is a self hosted personal cloud system. In Nextcloud Server and Server Enterprise prior to 31.0.12 and 32.0.3, a missing sanitization allowed malicious users to circumvent the content security policy when a malicious user manages to trick a user it viewing an uploaded SVG outside of the Nextcloud Servers web page.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Nextcloud | Nextcloud Server | >= 31.0.0, < 31.0.12 |
| Nextcloud | Nextcloud Server | >= 32.0.0, < 32.0.3 |
References
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qcw2-p26m-9gc5Patch, Vendor Advisory
- https://github.com/nextcloud/viewer/pull/3023Issue Tracking
- https://hackerone.com/reports/3357808Issue Tracking, Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
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How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
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