What is CVE-2026-7890?

CVE-2026-7890 is a medium-severity vulnerability in Concrete Cms, classified under Server-Side Request Forgery (SSRF). CVSS score: 6.4/10. Published 2026-05-21.

How severe is CVE-2026-7890?

Medium severity. CVSS v3 base score is 6.4 out of 10.

SSRF in Concrete Cms

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 validation enabling redirect-to-internal bypasses. The Concrete CMS security team gave this vulnerability…

Vulnerability class: SSRF (Server-Side Request Forgery)

EPSS: 0.000 (7.2th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 6.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N.

Affected products

Concrete Cms — versions 5.0
Concretecms Concrete_cms

Weakness classification (CWE)

CWE-918 — Server-Side Request Forgery (SSRF)

References

ff5b8ace-8b95-4078-9743-eac1ca5451de (release-notes, Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2026-7890?: CVE-2026-7890 is a medium-severity vulnerability in Concrete Cms, classified under Server-Side Request Forgery (SSRF). CVSS score: 6.4/10. Published 2026-05-21.
How severe is CVE-2026-7890?: Medium severity. CVSS v3 base score is 6.4 out of 10.