CVE-2026-4032Network attack vector

Unauthenticated stored XSS via unescaped shortcode class

Published Apr 16, 2026 · Updated Apr 16, 2026

Stored XSS in Dmytro Shteflyuk CodeColorer 0 through 0.10.1 allows remote attackers to inject scripts through a comment shortcode. The cc comment-shortcode path inserts the attacker-controlled class parameter into a wrapper element's class attribute without sanitizing or escaping it. Comments and guest comments must be enabled, and the script runs in a user's browser when that user views the injected page.

CVSS severity6.1
Medium
EPSS probability0.23%
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 Dmytro Shteflyuk CodeColorer 0 through 0.10.1 allows remote attackers to inject scripts through a comment shortcode. The cc comment-shortcode path inserts the attacker-controlled class parameter into a wrapper element's class attribute without sanitizing or escaping it. Comments and guest comments must be enabled, and the script runs in a user's browser when that user views the injected page.

The record

CVE
CVE-2026-4032
Published
Apr 16, 2026
Updated
Apr 16, 2026
Vendor
Dmytro Shteflyuk
Product
CodeColorer
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 16, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 16, 2026Record 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=0 <=0.10.1

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Dmytro Shteflyuk · CodeColorerversion=0 <=0.10.1

Published CVSS scores

6.1WordfenceCVSS:3.1/AV:N/AC:L/PR:N/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
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

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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