Autoptimize, Clearfy Cache, Speed Optimizer: Cross-site scripting
Autoptimize, Clearfy Cache, Speed Optimizer is affected by cross-site scripting. The vulnerable path is reachable without authentication. Injected script can execute in the affected site's origin when the vulnerable output is viewed. The published affected range is < 3.1.15, < 2.4.2, < 7.7.9.
- Component
- Autoptimize, Clearfy Cache, Speed Optimizer
- Plugin slug
autoptimize- Affected
- < 3.1.15, < 2.4.2, < 7.7.9
- Safe version
3.1.15, 2.4.2, 7.7.9- Published
- May 18, 2026
This CVE was published May 18, 2026 and is one of 11 known issues for this plugin.
Update, patch or deactivate.
Update Autoptimize, Clearfy Cache, Speed Optimizer to a release outside the affected range, or disable and remove it until a fixed version is available.
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 Autoptimize WordPress plugin before 3.1.15, Clearfy Cache WordPress plugin before 2.4.2, Speed Optimizer WordPress plugin before 7.7.9 are vulnerable to unauthenticated Stored Cross-Site Scripting (XSS) due to a predictable replacement hash used during the HTML minification process and abusing a regular expression. This allows an attacker to inject arbitrary HTML attributes in the final HTML output by anticipating the placeholder format.
CVE / CNA vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H