🛡️ CVE-2026-7890
🟡 CVSS 6.4 — Medium ✅ No Known Exploit CWE-918 NVD
6.4
CVSS Score
0 Low4 Medium7 High9 Critical10

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.

Details

Severity MEDIUM
CVSS Score 6.4
CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
CWE CWE-918
Public Exploit ✅ No
Source NVD
Published 2026-05-21
Updated 2026-06-02
Modified 2026-05-22
Fix URL N/A

Affected Packages

Software From version Fixed in
concrete-cms 9.5.1
unknown

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