What’s Vulnerable › Vulnerabilities

CVE-2024-8291: Concrete CMS Stored XSS in Image Editor Background Color

• Severity: medium (CVSS 4.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-09-25 · updated 2026-06-17
• Weakness: CWE-22

Description

Concrete CMS versions 9.0.0 to 9.3.3 and below 8.5.19 are vulnerable to Stored XSS in Image Editor Background Color.  A rogue admin could add malicious code to the Thumbnails/Add-Type. The Concrete CMS Security Team gave this 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,  Alexey Solovyev 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 products

• Concrete CMS: from 9.0.0 before 9.3.3 — fixed in 9.3.3

How to fix

Upgrade to a fixed version: Concrete CMS 9.3.3. Check the vendor advisory for mitigations.

References

• https://documentation.concretecms.org/9-x/developers/introduction/version-history/934-release-notes
• https://documentation.concretecms.org/developers/introduction/version-history/8519-release-notes
• https://github.com/concretecms/concretecms/commit/dbce253166f6b10ff3e0c09e50fd395370b8b065
• https://github.com/concretecms/concretecms/pull/12183

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