Speed Optimizer: Cross-site scripting
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). Other endpoint, parameter, role or implementation details not named in this export are not established by this record. Affected versions: before 7.8.5.
- Component
- Speed Optimizer
- Plugin slug
speed-optimizer- Affected
- < 7.8.5
- Safe version
7.8.5- Published
- Oct 23, 2026
This CVE was published Oct 23, 2026 and is one of 3 known issues for this plugin.
Update, patch or deactivate.
The authoritative export identifies 7.8.5 as fixed. Update to the applicable fixed release or a later supported release. Validate untrusted input and apply context-appropriate output escaping at the affected rendering point; enforce permissions independently of nonces.
A safe version is available, so updating to that version or later is the preferred remediation. If an immediate update is not practical, consider a targeted application patch or temporarily restricting the affected functionality.
Deactivate only when warranted by your risk profile, or when advised by your hosting provider in the limited circumstances where the vulnerability cannot otherwise be mitigated. If you’re unsure which action is appropriate, contact Fused or your hosting provider for guidance.
Technical 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).
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:U/C:L/I:L/A:N