CVE-2023-50833

Colibri Page Builder <= 1.0.240 - Authenticated (Contributor+) Stored Cross-Site Scripting via Shortcode

2023-12-19 00:00
LVT-tholv2k

Strategic Overview

Status
Patched in 1.0.241
Affected Plugin
Colibri Page Builder
Affected Version
<= 1.0.240
CVSS
6.4Medium
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2023-50833
View all Colibri Page Builder vulnerabilities

At a glance

CVE-2023-50833 is a medium-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Colibri Page Builder WordPress plugin, affecting versions <= 1.0.240. It carries a CVSS score of 6.4 (reachable over the network; low attack complexity). Exploitation requires an authenticated account at Contributor level or above. The issue is fixed in version 1.0.241; sites on affected versions should update now. Disclosed December 2023, reported by LVT-tholv2k.

Vulnerability Overview

The Colibri Page Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting in all versions up to, and including, 1.0.240 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers with contributor-level and above permissions to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

Technical Analysis

The vector marks this flaw as remotely reachable over the network, with low attack complexity — no special timing or configuration is needed, and no interaction from a victim user.

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

Reaching this weakness in Colibri Page Builder <= 1.0.240 takes an account at Contributor level or above. Cross-site scripting happens when input from a request is written into a page without being escaped for the context it lands in, so the browser parses attacker-supplied text as markup or script.

Injected script runs with the privileges of whoever views the affected page, which is how these flaws turn into administrator session theft, silent account creation or persistent backdoors in page content. For Colibri Page Builder the fix is 1.0.241: builds <= 1.0.240 are affected, anything from 1.0.241 onward is not.

Remediation

Update to version 1.0.241, or a newer patched version

How does WordSec protect against this?

An attacker needs Contributor access first, so the firewall sees the attempt as traffic from a logged-in account: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Colibri Page Builder 1.0.241 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2023-50833https://www.wordfence.com/threat-intel/vulnerabilities/id/532d185c-4384-4b15-a104-42f8d2a1ca23https://nvd.nist.gov/vuln/detail/CVE-2023-50833

Related records

Vulnerability data © Defiant, Inc., provided under the Wordfence Intelligence T&C