CVE-2026-7890

Vulnerability 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. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 2.1 with a 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.

Related Weaknesses (CWE)

CWE-918

References

https://documentation.concretecms.org/9-x/developers/introduction/version-histor

FAQ

What is CVE-2026-7890?

CVE-2026-7890 is a documented vulnerability. 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. The Concrete CMS...

How severe is CVE-2026-7890?

CVSS scoring is not yet available for CVE-2026-7890. Check NVD for updates.

Is there a patch for CVE-2026-7890?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.