What is GHSA-gjwq-9v8p-47w7?

GHSA-gjwq-9v8p-47w7 is a security advisory published by GitHub Security Advisories with Low severity. Concrete CMS's RSS Displayer block accepts a feed URL from any page editor and fetches it server-side without validation

Which CVE IDs does GHSA-gjwq-9v8p-47w7 cover?

GHSA-gjwq-9v8p-47w7 covers the following CVE IDs: CVE-2026-7890. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

Which products are affected by GHSA-gjwq-9v8p-47w7?

GHSA-gjwq-9v8p-47w7 affects 1 product, including: composer/concrete5/concrete5:\u003c 9.5.1.

GHSA-gjwq-9v8p-47w7Low

Concrete CMS's RSS Displayer block accepts a feed URL from any page editor and fetches it server-side without validation

Vendor

GitHub Security Advisories

Published

May 22, 2026

Last Modified

June 24, 2026

🔗 CVE IDs covered (1)

CVE-2026-7890 →

📋 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.

🎯 Affected products1

composer/concrete5/concrete5:< 9.5.1

🔗 References (3)

https://nvd.nist.gov/vuln/detail/CVE-2026-7890
https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes
https://github.com/advisories/GHSA-gjwq-9v8p-47w7