CVE-2024-4350Network attack vector

Stored XSS via unescaped RSS Displayer title

Published Aug 9, 2024 · Updated Sep 25, 2025

Stored XSS in Concrete CMS before 8.5.18 and 9.0.0 through 9.3.2 allows remote authenticated users to inject script through RSS titles. The RSS Displayer view writes its stored title directly into an h5 element without applying the h() HTML-escaping helper. Administrator access is required, and execution can disclose data available to the rendered page without altering data or interrupting service.

CVSS severity5.1
Medium
EPSS probability0.49%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Concrete CMS before 8.5.18 and 9.0.0 through 9.3.2 allows remote authenticated users to inject script through RSS titles. The RSS Displayer view writes its stored title directly into an h5 element without applying the h() HTML-escaping helper. Administrator access is required, and execution can disclose data available to the rendered page without altering data or interrupting service.

The record

CVE
CVE-2024-4350
Published
Aug 9, 2024
Updated
Sep 25, 2025
Vendor
Concrete CMS
Product
Concrete CMS
Classifications
CWE-79, CAPEC-592, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 9, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 25, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.0.0 <8.5.18
  2. Affected versionversion=9.0.0 <9.3.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Concrete CMS · Concrete CMSversion=5.0.0 <8.5.18; version=9.0.0 <9.3.3

Published CVSS scores

5.1Concrete CMS CNACVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
2.1Concrete CMSCVSS:4.0/AV:N/AC:H/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
3.0Concrete CMSCVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:L/I:N/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-592Stored XSS
T1059.007JavaScript/JScript

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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