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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.

PUBLISHED Reserved 2026-05-05 | Published 2026-05-21 | Updated 2026-05-22 | Assigner ConcreteCMS




LOW: 2.1CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:N/VI:L/VA:N/SC:L/SI:N/SA:N

Problem types

CWE-918 Server-Side request forgery (SSRF)

Product status

Default status
unaffected

5.0 (git)
affected

References

documentation.concretecms.org/...n-history/951-release-notes release-notes

cve.org (CVE-2026-7890)

nvd.nist.gov (CVE-2026-7890)

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