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NVD Vulnerability Details :

CVE-2026-7890

Received

Source-ff5b8ace-8b95-4078-9743-eac1ca5451de

Published At-21 May, 2026 | 22:16

Updated At-21 May, 2026 | 22:16

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.

Date Added	Due Date	Vulnerability Name	Required Action
	N/A

Metrics

Type	Version	Base score	Base severity	Vector
Secondary	4.0	2.1	LOW	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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Type: Secondary

Version: 4.0

Base score: 2.1

Base severity: LOW

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

Weaknesses

CWE ID	Type	Source
CWE-918	Secondary	ff5b8ace-8b95-4078-9743-eac1ca5451de

CWE ID: CWE-918

Type: Secondary

Source: ff5b8ace-8b95-4078-9743-eac1ca5451de

References

Hyperlink	Source	Resource
https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes	ff5b8ace-8b95-4078-9743-eac1ca5451de	N/A

Hyperlink: https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes

Source: ff5b8ace-8b95-4078-9743-eac1ca5451de

Resource: N/A

CISA Catalog

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Weaknesses

Evaluator Description

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Vendor Statements

References

Change History