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CVE-2024-4350

Concrete CMS version 9 below 9.3.3 and below 8.5.18 are vulnerable to Stored XSS in RSS Displayer

MEDIUM
4.8
CVSS Score
Published: August 9, 2024 at 12:37 AM UTC
Updated: June 17, 2026 at 08:01 AM UTC
1 product affected across 1 vendorConcrete CMS

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Severity
MEDIUM4.8
Exploit prediction
EPSS 0.5%
SSVC
No known exploit

Description

Concrete CMS versions 9.0.0 to 9.3.2 and below 8.5.18 are vulnerable to Stored XSS in RSS Displayer when user input is stored and later embedded into responses. A rogue administrator could inject malicious code into fields due to insufficient input validation. The Concrete CMS security team gave this vulnerability a CVSS v4 score of 5.1 with vector https://www.first.org/cvss/calculator/4.0#CVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N CVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N Thanks, m3dium for reporting. (CNA updated this risk rank on 17 Jan 2025 by lowering the AC based on CVSS 4.0 documentation that access privileges should not be considered for AC)

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Concrete CMS· Concretecms
95%
v < 8.5.185.0.0 ≤ v < 8.5.189.0.0 ≤ v < 9.3.35.0.09.0.0
Affected range stops below 8.5.18, so it looks safe — our inference, not a vendor statement
Affected range stops below 9.3.3, so it looks safe — our inference, not a vendor statement

References (4)

Release NotesVendor Advisory
Source: ff5b8ace-8b95-4078-9743-eac1ca5451de
https://documentation.concretecms.org/9-x/developers/introduction/version-history/933-release-notes?pk_vid=e367a434ef4830491723060415d52041
Release NotesVendor Advisory
Source: ff5b8ace-8b95-4078-9743-eac1ca5451de
https://documentation.concretecms.org/developers/introduction/version-history/8518-release-notes?pk_vid=e367a434ef4830491723055758d52041
Patch
Source: ff5b8ace-8b95-4078-9743-eac1ca5451de
https://github.com/concretecms/concretecms/commit/c08d9671cec4e7afdabb547339c4bc0bed8eab06
Patch
Source: ff5b8ace-8b95-4078-9743-eac1ca5451de
https://github.com/concretecms/concretecms/pull/12166

SSVC — Action Prioritization

SSVCNo known exploitNot automatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

4.8MEDIUM[email protected]
Attack Vector
NETWORK
Complexity
LOW
Privileges
HIGH
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality
LOW
Integrity
LOW
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-20CWE-79

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