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Vulnerability Details :

CVE-2026-7890

Summary
Assigner-ConcreteCMS
Assigner Org ID-ff5b8ace-8b95-4078-9743-eac1ca5451de
Published At-21 May, 2026 | 21:43
Updated At-22 May, 2026 | 12:54
Rejected At-
Credits

Concrete CMS 9.5.0 is vulnerable to SSRF via RSS Displayer Block

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.

Vendors
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Not available
Products
-
Metrics (CVSS)
VersionBase scoreBase severityVector
Weaknesses
Attack Patterns
Solution/Workaround
References
HyperlinkResource Type
EPSS History
Score
Latest Score
-
N/A
No data available for selected date range
Percentile
Latest Percentile
-
N/A
No data available for selected date range
Stakeholder-Specific Vulnerability Categorization (SSVC)
▼Common Vulnerabilities and Exposures (CVE)
cve.org
Assigner:ConcreteCMS
Assigner Org ID:ff5b8ace-8b95-4078-9743-eac1ca5451de
Published At:21 May, 2026 | 21:43
Updated At:22 May, 2026 | 12:54
Rejected At:
▼CVE Numbering Authority (CNA)
Concrete CMS 9.5.0 is vulnerable to SSRF via RSS Displayer Block

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.

Affected Products
Vendor
Concrete CMS
Product
Concrete CMS
Collection URL
https://github.com/concretecms/concretecms
Repo
https://github.com/concretecms/concretecms
Default Status
unaffected
Versions
Affected
  • From 5.0 through 9.5.0 (git)
Problem Types
TypeCWE IDDescription
CWECWE-918CWE-918 Server-Side request forgery (SSRF)
Type: CWE
CWE ID: CWE-918
Description: CWE-918 Server-Side request forgery (SSRF)
Metrics
VersionBase scoreBase severityVector
4.02.1LOW
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
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
Metrics Other Info
Impacts
CAPEC IDDescription
CAPEC-664CAPEC-664 Server Side Request Forgery
CAPEC ID: CAPEC-664
Description: CAPEC-664 Server Side Request Forgery
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes
release-notes
Hyperlink: https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notes
Resource:
release-notes
▼Authorized Data Publishers (ADP)
CISA ADP Vulnrichment
Affected Products
Metrics
VersionBase scoreBase severityVector
Metrics Other Info
Impacts
CAPEC IDDescription
Solutions
Configurations
Workarounds
Exploits
Credits
Timeline
EventDate
Replaced By
Rejected Reason
References
HyperlinkResource
Information is not available yet
▼National Vulnerability Database (NVD)
nvd.nist.gov
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.

CISA Catalog
Date AddedDue DateVulnerability NameRequired Action
N/A
Date Added: N/A
Due Date: N/A
Vulnerability Name: N/A
Required Action: N/A
Metrics
TypeVersionBase scoreBase severityVector
Secondary4.02.1LOW
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
CPE Matches
Weaknesses
CWE IDTypeSource
CWE-918Secondaryff5b8ace-8b95-4078-9743-eac1ca5451de
CWE ID: CWE-918
Type: Secondary
Source: ff5b8ace-8b95-4078-9743-eac1ca5451de
Evaluator Description
Evaluator Impact

Evaluator Solution

Vendor Statements
References
HyperlinkSourceResource
https://documentation.concretecms.org/9-x/developers/introduction/version-history/951-release-notesff5b8ace-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

Change History

0
Information is not available yet

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