GHSA-gjwq-9v8p-47w7

ghsaUSosv

Concrete CMS's RSS Displayer block accepts a feed URL from any page editor and fetches it server-side without validation

view advisory published 2026-05-22Licence: CC-BY-4.0

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.

describes (1)

Related CVEs.

ID	severity	EPSS	exploitable	published
CVE-2026-7890US	medium6.4	0.15% (4th)	—	2026-05-21
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 bypasse…

references

External citations — patches, advisories, analysis.

https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notesWEB
https://github.com/concretecms/concretecmsPACKAGE
https://nvd.nist.gov/vuln/detail/CVE-2026-7890ADVISORY

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