CVE-2023-28477Network attack vector

Stored XSS via unescaped API integration name

Published Apr 28, 2023 · Updated Aug 2, 2024

Stored XSS in Concrete CMS 8.5.12 and earlier and 9.0 through 9.1.3 allows remote authenticated users to run script through API Integration names. The API Integration view_client.php template renders client->getName() directly into HTML without escaping, allowing stored special characters to become executable markup. Administrative access is required to create an API Integration; the payload executes when the integration or client-detail dashboard renders its name.

CVSS severity5.5
Medium
EPSS probability0.58%
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 8.5.12 and earlier and 9.0 through 9.1.3 allows remote authenticated users to run script through API Integration names. The API Integration view_client.php template renders client->getName() directly into HTML without escaping, allowing stored special characters to become executable markup. Administrative access is required to create an API Integration; the payload executes when the integration or client-detail dashboard renders its name.

The record

CVE
CVE-2023-28477
Published
Apr 28, 2023
Updated
Aug 2, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Apr 28, 2023CVE publishedPublication date reported by the CVE source.
  2. Aug 2, 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?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

5.5Concrete CMSCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:L/A:N
5.4NIST NVDCVSS:3.1/AV:N/AC:L/PR:L/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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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/JScript

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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