CVE-2023-50833Network attack vector

Stored XSS via insufficient shortcode sanitization

Published Dec 21, 2023 · Updated Apr 28, 2026

Stored XSS in Extend Themes Colibri Page Builder 1.0.239 and earlier allows remote authenticated users to inject web scripts. The affected shortcode path stores content without sufficient input sanitization or output escaping, so injected scripts run when a user opens the page. Contributor-level access is sufficient, and execution occurs in the viewing user's browser context, enabling data access or actions available to that session.

CVSS severity6.5
Medium
EPSS probability0.37%
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 1.0.239 and earlier allows remote authenticated users to inject web scripts. The affected shortcode path stores content without sufficient input sanitization or output escaping, so injected scripts run when a user opens the page. Contributor-level access is sufficient, and execution occurs in the viewing user's browser context, enabling data access or actions available to that session.

The record

CVE
CVE-2023-50833
Published
Dec 21, 2023
Updated
Apr 28, 2026
Vendor
Extend Themes
Product
Colibri Page Builder
Classifications
CWE-79, CAPEC-592, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 21, 2023CVE publishedPublication date reported by the CVE source.
  2. Apr 28, 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=n/a <=1.0.239

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Extend Themes · Colibri Page Builderversion=n/a <=1.0.239

Published CVSS scores

6.5PatchstackCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L
5.4NVDCVSS: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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC-592Stored XSS
T1059.007JavaScript/JScript

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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