CVE-2024-8660Network attack vector

Stored XSS via unescaped navigation output

Published Sep 17, 2024 · Updated Sep 18, 2024

Stored XSS in the Top Navigator Bar block in Concrete CMS 9.0.0 through 9.3.3 allows remote authenticated users to run script in visitors’ browsers. The concrete/blocks/top_navigation_bar/view.php template emits administrator-controlled branding text and navigation item names without HTML escaping. An administrator must save the payload, and a targeted user must visit the home page; execution is confined to the visitor’s browser context.

CVSS severity4.6
Medium
EPSS probability0.29%
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 the Top Navigator Bar block in Concrete CMS 9.0.0 through 9.3.3 allows remote authenticated users to run script in visitors’ browsers. The concrete/blocks/top_navigation_bar/view.php template emits administrator-controlled branding text and navigation item names without HTML escaping. An administrator must save the payload, and a targeted user must visit the home page; execution is confined to the visitor’s browser context.

The record

CVE
CVE-2024-8660
Published
Sep 17, 2024
Updated
Sep 18, 2024
Vendor
Concrete CMS
Product
Concrete CMS
Classifications
CWE-79
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Sep 17, 2024CVE publishedPublication date reported by the CVE source.
  2. Sep 18, 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=9.0.0 <9.3.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Concrete CMS · Concrete CMSversion=9.0.0 <9.3.4

Published CVSS scores

4.6Concrete CMSCVSS:4.0/AV:N/AC:L/AT:N/PR:H/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N
4.8NISTCVSS: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')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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