CVE-2024-2753Network attack vector

Stored script execution via unescaped calendar colors

Published Apr 3, 2024 · Updated Aug 30, 2024

Stored cross-site scripting in Concrete CMS 5.0.0 through 8.5.15 and 9.0.0 through 9.2.7 allows remote authenticated users to run JavaScript. The calendar colors view passes default and topic background and text color values directly to the color-widget output without HTML escaping. A rogue administrator must store the payload, and JavaScript runs only when another user opens the Calendar Color Settings screen, exposing that user's browser data.

CVSS severity2.0
Low
EPSS probability0.36%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in Concrete CMS 5.0.0 through 8.5.15 and 9.0.0 through 9.2.7 allows remote authenticated users to run JavaScript. The calendar colors view passes default and topic background and text color values directly to the color-widget output without HTML escaping. A rogue administrator must store the payload, and JavaScript runs only when another user opens the Calendar Color Settings screen, exposing that user's browser data.

The record

CVE
CVE-2024-2753
Published
Apr 3, 2024
Updated
Aug 30, 2024
Vendor
Concrete CMS
Product
Concrete CMS
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 3, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 30, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

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

  1. Affected versionversion=5.0.0 <8.5.16
  2. Affected versionversion=9.0.0 <9.2.8

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Concrete CMS · Concrete CMSversion=5.0.0 <8.5.16; version=9.0.0 <9.2.8

Published CVSS scores

4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
2.0ConcreteCMSCVSS:3.1/AV:N/AC:H/PR:H/UI:R/S:U/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')
T1059.007Command and Scripting Interpreter: JavaScript

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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