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.
Fix
Patch, vendor advisory and mitigation references on NVD 3
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qcw2-p26m-9gc5 Patch, Vendor Advisory
- https://github.com/nextcloud/viewer/commit/5044a27d61bc40c0f134298d36af91f865335b63 Patch
- https://hackerone.com/reports/3357808 Issue Tracking, Vendor Advisory
Every line above is quoted from NVD, CISA, Microsoft, the vendor's own advisory or DISA; nothing is generated.
Change history 1
- First seenCVSS 6.1 · nextcloudNVD modified 2026-10-18 14:10
Affected (CPE criteria) 2
cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:-:*:*:*cpe:2.3:a:nextcloud:nextcloud_server:*:*:*:*:enterprise:*:*:*
References 4
- https://github.com/nextcloud/security-advisories/security/advisories/GHSA-qcw2-p26m-9gc5 Patch, Vendor Advisory
- https://github.com/nextcloud/viewer/commit/5044a27d61bc40c0f134298d36af91f865335b63 Patch
- https://github.com/nextcloud/viewer/pull/3023 Issue Tracking
- https://hackerone.com/reports/3357808 Issue Tracking, Vendor Advisory