CVE-2026-7890 LOW

CVE-2026-7890: Concrete CMS 9.5.0 is vulnerable to SSRF via RSS Displayer Block

Vendor Concrete Cms
Product Concrete CMS
Weakness CWE-918 · SSRF
Published May 21, 2026
Last update May 22, 2026
View on NVD All CVEs

CVSS base score

2.1/10
Attack vector Network
Attack complexity Low
Privileges required High
User interaction None
Confidentiality —
Integrity —

CVSS 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

What the vulnerability does

01Description

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.

Key dates

02Disclosure timeline

May 21, 2026 CVE published
May 22, 2026 Record updated