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.
Update concrete5/concrete5 to 9.5.1 if you use the affected versions. Test the change in a non-production environment first.
Local check
hol-guard supply-chain scanConcrete CMS's RSS Displayer block accepts a feed URL from any page editor and fetches it server-side without validation affects concrete5/concrete5 (composer). Severity is low. 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.
AI coding agents often install or upgrade packages automatically in composer. A low vulnerability in a dependency can be pulled into a project through a normal install or update without a human reviewing the change, expanding the blast radius from a single package to every agent workspace that depends on it.
| Package | Affected range | Fixed version |
|---|---|---|
| concrete5/concrete5composer | <9.5.1 | 9.5.1 |
Fixed versions are reported by the source feed; confirm compatibility before updating.
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.
Update concrete5/concrete5 to 9.5.1 if you use the affected versions. Test the change in a non-production environment first.
Local check
hol-guard supply-chain scanConcrete CMS's RSS Displayer block accepts a feed URL from any page editor and fetches it server-side without validation affects concrete5/concrete5 (composer). Severity is low. 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.
AI coding agents often install or upgrade packages automatically in composer. A low vulnerability in a dependency can be pulled into a project through a normal install or update without a human reviewing the change, expanding the blast radius from a single package to every agent workspace that depends on it.
| Package | Affected range | Fixed version |
|---|---|---|
| concrete5/concrete5composer | <9.5.1 | 9.5.1 |
Fixed versions are reported by the source feed; confirm compatibility before updating.
Reported by GitHub Security Advisories (ghsa).
HOL Guard can help your team review package activity against supported protection paths.
Explore HOL GuardReported by GitHub Security Advisories (ghsa).
HOL Guard can help your team review package activity against supported protection paths.
Explore HOL Guard