CVE-2026-88783: CWE-79 Cross-Site Scripting (XSS) in Kubio AI Page Builder
The Kubio AI Page Builder WordPress plugin before 2.9.3 does not limit its widening of the allowed HTML elements to the editor context, so the wider set is applied when filtering content submitted by unauthenticated users as well, allowing them to store markup which the Kubio AI Page Builder WordPress plugin before 2.9.3's own script later executes in the browser of any visitor, or of an administrator reviewing the still-unapproved submission.
AI Analysis
Technical Summary
The Kubio AI Page Builder WordPress plugin prior to version 2.9.3 does not restrict the expanded set of allowed HTML elements to the editor context only. Instead, it applies this broader filtering to content submitted by unauthenticated users, allowing them to inject and store malicious markup. This stored markup is subsequently executed by the plugin's script in the browsers of visitors or administrators who view the unapproved content, resulting in a stored Cross-Site Scripting (CWE-79) vulnerability.
Potential Impact
An attacker can submit malicious HTML/JavaScript code that is stored by the plugin and executed in the browsers of site visitors or administrators reviewing unapproved content. This can lead to theft of cookies, session tokens, or other sensitive information, and potentially allow further attacks within the context of the affected site. The vulnerability affects unauthenticated users, increasing the risk of exploitation.
Mitigation Recommendations
Upgrade the Kubio AI Page Builder plugin to version 2.9.3 or later, where this issue is fixed. No other mitigation guidance is provided in the advisory. Patch status is confirmed by the version boundary indicating the fix in 2.9.3.
CVE-2026-88783: CWE-79 Cross-Site Scripting (XSS) in Kubio AI Page Builder
Description
The Kubio AI Page Builder WordPress plugin before 2.9.3 does not limit its widening of the allowed HTML elements to the editor context, so the wider set is applied when filtering content submitted by unauthenticated users as well, allowing them to store markup which the Kubio AI Page Builder WordPress plugin before 2.9.3's own script later executes in the browser of any visitor, or of an administrator reviewing the still-unapproved submission.
CVSS v3.1
Score 8.8high
Affected software
Kubio AI Page Builder
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Kubio AI Page Builder WordPress plugin prior to version 2.9.3 does not restrict the expanded set of allowed HTML elements to the editor context only. Instead, it applies this broader filtering to content submitted by unauthenticated users, allowing them to inject and store malicious markup. This stored markup is subsequently executed by the plugin's script in the browsers of visitors or administrators who view the unapproved content, resulting in a stored Cross-Site Scripting (CWE-79) vulnerability.
Potential Impact
An attacker can submit malicious HTML/JavaScript code that is stored by the plugin and executed in the browsers of site visitors or administrators reviewing unapproved content. This can lead to theft of cookies, session tokens, or other sensitive information, and potentially allow further attacks within the context of the affected site. The vulnerability affects unauthenticated users, increasing the risk of exploitation.
Mitigation Recommendations
Upgrade the Kubio AI Page Builder plugin to version 2.9.3 or later, where this issue is fixed. No other mitigation guidance is provided in the advisory. Patch status is confirmed by the version boundary indicating the fix in 2.9.3.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 2026-09-10T07:42:38.158Z
- State
- PUBLISHED
Threat ID: 6ac11725a43b0b3b89cacf71
Added to database: 10/03/2026, 14:54:29 UTC
Last enriched: 10/03/2026, 14:56:51 UTC
Last updated: 10/04/2026, 05:45:56 UTC
Views: 13
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