CVE-2026-7890
MEDIUM WAF: Medium
CVSS 6.4
Published: 2026-05-21
CWE-918
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.
WAF Coverage Analysis
Server-Side Request Forgery (SSRF)
Medium WAF Coverage
OWASP: A10:2021 SSRF
934xxx - Node.js / Generic Injection
Affected Software
| Vendor | Product | Version |
|---|---|---|
| concretecms | concrete_cms | up to 9.5.1 |
References
- documentation.concretecms.org (Vendor Advisory, Release Notes)