CVE-2026-7890
RSS Displayer Block Server-Side Request Forgery in Concrete CMS
Publication date: 2026-05-21
Last updated on: 2026-05-21
Assigner: ConcreteCMS
Description
Description
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| concrete_cms | concrete_cms | to 9.5.1 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-918 | The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination. |
Attack-Flow Graph
AI Powered Q&A
Can you explain this vulnerability to me?
This vulnerability exists in Concrete CMS version 9.5.0 and below, specifically in the RSS Displayer block. The block accepts a feed URL from any page editor and fetches it server-side without validating the URL properly. This lack of validation allows attackers to perform redirect-to-internal bypasses.
How can this vulnerability impact me? :
The vulnerability could allow an attacker with high privileges (page editor) to cause the server to fetch unintended internal resources by bypassing URL validation. This could potentially lead to information disclosure or other unintended server-side actions, although the overall severity is low as indicated by the CVSS score of 2.1.