CVE-2026-111737: CWE-79 Cross-Site Scripting (XSS) in Speed Optimizer
Description
The Speed Optimizer WordPress plugin before 7.8.5 does not sanitise or escape some of its settings before outputting them in the head of front-end pages, which could allow high-privilege users such as admins to perform Stored Cross-Site Scripting attacks even when the unfiltered_html capability is disallowed (for example in a multisite setup).
CVSS v3.1
3.5low
Affected software
Speed Optimizer
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Speed Optimizer WordPress plugin prior to version 7.8.5 fails to sanitize or escape certain settings before rendering them in the head section of front-end pages. This vulnerability enables stored Cross-Site Scripting (CWE-79) attacks by high-privilege users, including admins, bypassing restrictions like the disallowance of the unfiltered_html capability. The issue affects all versions from 0 up to but not including 7.8.5.
Potential Impact
An attacker with high privileges (e.g., an administrator) can inject malicious JavaScript code that is stored and executed in the context of front-end pages. This can lead to session hijacking, defacement, or other malicious actions executed in the browsers of site visitors. The vulnerability bypasses typical WordPress capability restrictions, increasing the risk in multisite environments.
Mitigation Recommendations
Upgrade Speed Optimizer to version 7.8.5 or later where this vulnerability is fixed. No other vendor advisory information is provided, so patching to the fixed version is the recommended remediation.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- WPScan
- Date Reserved
- 10/16/2026
- State
- PUBLISHED
Threat ID: 6adafb984d27ba8daad77784
Added to database: 10/23/2026, 06:15:52 UTC
Last enriched: 10/23/2026, 06:31:05 UTC
Last updated: 10/24/2026, 08:59:42 UTC
Views: 15
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