CVE-2024-8291Network attack vector

Stored XSS via unescaped background color output

Published Sep 24, 2024 · Updated Jan 17, 2025

Stored XSS in Concrete CMS 5.0.0 through 8.5.18 and 9.0.0 through 9.3.3 allows remote authenticated users to inject browser code. The thumbnail dashboard page passes the saved Image Editor Background Color into the ftSaveAreaBackgroundColor control without HTML escaping, so markup stored through Thumbnails/Add-Type is rendered as executable content. Administrator access to Thumbnails/Add-Type is required, and the published impact is limited to reading data exposed in the affected browser context.

CVSS severity5.1
Medium
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Stored XSS in Concrete CMS 5.0.0 through 8.5.18 and 9.0.0 through 9.3.3 allows remote authenticated users to inject browser code. The thumbnail dashboard page passes the saved Image Editor Background Color into the ftSaveAreaBackgroundColor control without HTML escaping, so markup stored through Thumbnails/Add-Type is rendered as executable content. Administrator access to Thumbnails/Add-Type is required, and the published impact is limited to reading data exposed in the affected browser context.

The record

CVE
CVE-2024-8291
Published
Sep 24, 2024
Updated
Jan 17, 2025
Vendor
Concrete CMS
Product
Concrete CMS
Classifications
CWE-79, CWE-22, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 24, 2024CVE publishedPublication date reported by the CVE source.
  2. Jan 17, 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 <8.5.19
  2. Affected versionversion=9.0.0 <9.3.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Concrete CMS · Concrete CMSversion=5.0.0 <8.5.19; version=9.0.0 <9.3.4

Published CVSS scores

5.1ConcreteCMSCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N
4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/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')
CWE-22Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')
T1059.007Command and Scripting Interpreter: JavaScript/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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo