Medium severity6.4NVD Advisory· Published May 21, 2026· Updated May 22, 2026
CVE-2026-7890
CVE-2026-7890
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.
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Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
concrete5/concrete5Packagist | < 9.5.1 | 9.5.1 |
Affected products
2Patches
Vulnerability mechanics
References
3- documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notesnvdVendor AdvisoryRelease NotesWEB
- github.com/advisories/GHSA-gjwq-9v8p-47w7ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-7890ghsaADVISORY
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