CVE-2024-3338Network attack vector

Stored XSS via unescaped image alt data

Published May 2, 2024 · Updated Apr 8, 2026

Stored XSS in Extend Themes Colibri Page Builder 1.0.262 and earlier allows remote authenticated users to inject scripts via image alt data. The builder accepts image alternative-text data without sufficient input sanitization and later renders it into page output without escaping. Author-level access or higher is required, and the injected script runs when a user visits the affected page, exposing that user's browser session to attacker-controlled code.

CVSS severity4.4
Medium
EPSS probability0.42%
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 Extend Themes Colibri Page Builder 1.0.262 and earlier allows remote authenticated users to inject scripts via image alt data. The builder accepts image alternative-text data without sufficient input sanitization and later renders it into page output without escaping. Author-level access or higher is required, and the injected script runs when a user visits the affected page, exposing that user's browser session to attacker-controlled code.

The record

CVE
CVE-2024-3338
Published
May 2, 2024
Updated
Apr 8, 2026
Vendor
Extend Themes
Product
Colibri Page Builder
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. May 2, 2024CVE publishedPublication date reported by the CVE source.
  2. Apr 8, 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 <=1.0.262

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Extend Themes · Colibri Page Builderversion=0 <=1.0.262

Published CVSS scores

4.4WordfenceCVSS:3.1/AV:N/AC:H/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 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 exploitUnconfirmed

Weakness, pattern, technique

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

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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