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Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

CVE-2025-66512

Medium
5.4/10

Summary

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.

  • LOW
  • NETWORK
  • LOW
  • UNCHANGED
  • REQUIRED
  • NONE
  • NONE
  • LOW

CWE-80 - Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)

The software receives input from an upstream component, but it does not neutralize or incorrectly neutralizes special characters such as "<", ">", and "&" that could be interpreted as web-scripting elements when they are sent to a downstream component that processes web pages.

References

Advisory Timeline

  • Published