GitHub Advisoryadvisory · Packagist

GHSA-gjwq-9v8p-47w7 Concrete CMS's RSS Displayer block accepts a feed URL from any page editor and fetches it server-side without validation

LOW Published 2026-05-22 Modified 2026-06-24 Official page ↗
Aliases
CVE-2026-7890
Ecosystem
Packagist
Packages
concrete5/concrete5
Severity
Low
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:L/SI:N/SA:N
Weaknesses
CWE-918
Reviewed
2026-06-24

Affected packages

• Packagist concrete5/concrete5: < 9.5.1 → fixed in 9.5.1

Description

In Concrete CMS 9.5.0 and below, the RSS Displayer block accepts a feed URL from any page editor and fetches it server-side without validation enabling redirect-to-internal bypasses.

Related

Alias · CVE (1)

  • CVE-2026-7890 In Concrete CMS 9.5.0 and below, the RSS Displayer block accepts a feed URL from any page editor and fetches it server-side without… vulnerability

Weakness · CWE (1)

  • CWE-918 Server-Side Request Forgery weakness

References