Low CVSS 2.0

Overview

Concrete CMS versions 9 through 9.4.2 are vulnerable to Stored XSS from Home Folder on Members Dashboard page.  Version 8 was not affected. A rogue admin could set up a malicious folder containing XSS to which users could be directed upon login. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 2.0 with vector CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N. Thanks sealldev  (Noah Cooper) for reporting via HackerOne.

Risk analysis

This vulnerability is rated 🟢 LOW.

  • CVSS: 2.0 (LOW)
  • Detected tags: stored_xss, xss (tag impact: MODERATE)

Recommended actions:

  • Sanitize stored input and enforce CSP.
  • Apply context-aware output encoding.
  • Enable Content-Security-Policy and HttpOnly/SameSite cookies.

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