CVE-2026-107758

Colibri Page Builder <= 1.0.390 - Unauthenticated Stored Cross-Site Scripting via Comments

2026-10-15 15:13
Tudor Lasuschevici (Eutiphron)

Strategic Overview

Status
Patched in 1.0.392
Affected Plugin
Colibri Page Builder
Affected Version
<= 1.0.390
CVSS
7.2High
Weakness type
CWE-79 · Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CVE
CVE-2026-107758
View all Colibri Page Builder vulnerabilities

At a glance

CVE-2026-107758 is a high-severity Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in the Colibri Page Builder WordPress plugin, affecting versions <= 1.0.390. It carries a CVSS score of 7.2 (reachable over the network; low attack complexity). Exploitation requires no authentication. The issue is fixed in version 1.0.392; sites on affected versions should update now. Disclosed October 2026, reported by Tudor Lasuschevici (Eutiphron).

Vulnerability Overview

The Colibri Page Builder plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'comment' parameter in all versions up to, and including, 1.0.390 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. The injected payload survives storage because the widened comment allow-list permits SVG elements with arbitrary data-* attributes; execution occurs because colibri.js, enqueued globally on every front-end page, reads the stored data-target value via jQuery.data() — which HTML-entity-decodes it — and passes the resulting string directly into jQuery(), which parses a leading '<' as HTML and fires the embedded event handler.

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 privileges on the target site, and no interaction from a victim user.

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

Colibri Page Builder <= 1.0.390 carries this weakness at comment, and reaching it takes no account at all. 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 1.0.392: builds <= 1.0.390 are affected, anything from 1.0.392 onward is not.

Remediation

Update to version 1.0.392, or a newer patched version

How does WordSec protect against this?

Requests carrying this pattern arrive without a session, so nothing upstream of the firewall gets a chance to reject them: WordSec's web application firewall inspects request payloads before WordPress loads them. None of that substitutes for the fix: Colibri Page Builder 1.0.392 closes this, and updating the plugin is the step that ends it.

  • Firewall
  • Login Security
  • Alerts

External References

https://www.cve.org/CVERecord?id=CVE-2026-107758https://www.wordfence.com/threat-intel/vulnerabilities/id/ccae5cbd-cfe6-48b3-8bcd-0b08ceb94680https://nvd.nist.gov/vuln/detail/CVE-2026-107758

Related records

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