CVE-2025-5153Public exploitNetwork attack vector

Stored script execution via unsanitized template descriptions

Published May 25, 2025 · Updated May 28, 2025

Stored cross-site scripting in CMS Made Simple 2.2.21 allows remote authenticated users to execute script through template descriptions. The Design Manager stores the Templates Description field without adequate sanitization and later renders the submitted HTML in its administrative interface. A CMS login and a later page view by another user are required; the script runs in that user's CMS origin and can modify displayed content.

CVSS severity5.1
Medium
EPSS probability0.34%
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 CMS Made Simple 2.2.21 allows remote authenticated users to execute script through template descriptions. The Design Manager stores the Templates Description field without adequate sanitization and later renders the submitted HTML in its administrative interface. A CMS login and a later page view by another user are required; the script runs in that user's CMS origin and can modify displayed content.

The record

CVE
CVE-2025-5153
Published
May 25, 2025
Updated
May 28, 2025
Vendor
CMS Made Simple Foundation
Product
CMS Made Simple
Classifications
CWE-94, CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 25, 2025CVE publishedPublication date reported by the CVE source.
  2. May 28, 2025Record 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=2.2.21

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

CMS Made Simple Foundation · CMS Made Simpleversion=2.2.21

Published CVSS scores

4.8NIST NVDCVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N
4.0VulDB CNAAV:N/AC:L/Au:S/C:N/I:P/A:N
3.5VulDB CNACVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
3.5VulDB CNACVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
5.1VulDB CNACVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1059.007Command and Scripting Interpreter: JavaScript/JScript

Public exploit references

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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