CVE-2023-4136Public exploitNetwork attack vector

Reflected XSS via unescaped XML API parameters

Published Aug 3, 2023 · Updated Feb 13, 2025

Reflected XSS in CrafterCMS Engine 3.1.0 through 3.1.27 and 4.0.0 through 4.0.2 allows remote attackers to run script via API requests. XML-producing API endpoints, including /api/1/site/url/transform and content-store routes, return url or transformerName input without neutralizing it for browser rendering. Exploitation requires a user to follow an attacker-controlled request, after which script runs in that user's browser context and can read exposed page data.

CVSS severity7.4
High
EPSS probability1.42%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reflected XSS in CrafterCMS Engine 3.1.0 through 3.1.27 and 4.0.0 through 4.0.2 allows remote attackers to run script via API requests. XML-producing API endpoints, including /api/1/site/url/transform and content-store routes, return url or transformerName input without neutralizing it for browser rendering. Exploitation requires a user to follow an attacker-controlled request, after which script runs in that user's browser context and can read exposed page data.

The record

CVE
CVE-2023-4136
Published
Aug 3, 2023
Updated
Feb 13, 2025
Vendor
Crafter Software Corporation
Product
CrafterCMS
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 3, 2023CVE publishedPublication date reported by the CVE source.
  2. Feb 13, 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=3.1.0 <=3.1.27
  2. Affected versionversion=4.0.0 <=4.0.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Crafter Software Corporation · CrafterCMSversion=3.1.0 <=3.1.27; version=4.0.0 <=4.0.2

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
7.4Crafter CMSCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/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.

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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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

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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