WPSpeed <= 2.6.10 - Authenticated (Subscriber+) Stored Cross-Site Scripting via User Nickname/Display Name
Summary
| CVE | CVE-2026-118784 |
|---|---|
| State | PUBLISHED |
| Assigner | Wordfence |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-11-07 10:17:06 UTC |
| Updated | 2026-11-07 18:17:13 UTC |
| Description | The WPSpeed plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 2.6.10 This is due to a combination of two issues in the LightImages HTML optimizer: (1) Dispatcher::runOptimize() decides whether the current request is the site's home page by comparing only the URL path from REQUEST_URI against the path of the home URL, so on a plain-permalinks install the author archive URL /?author=<ID> is treated as the home page and the LightImages optimizer runs on it; and (2) LightImages::optimize() calls html_entity_decode() across the entire serialized DOMDocument output under the default-enabled img_processing_entity_decode setting, converting any entity-encoded markup present as plain text in the page (including WordPress's rendered author title) into live HTML. This makes it possible for authenticated attackers, with Subscriber-level access and above, to store entity-encoded markup in their own nickname/display_name through the normal profile endpoint and have that markup rehydrated into executing script when any logged-out visitor loads their author archive. |
Risk And Classification
Primary CVSS: v3.1 6.4 MEDIUM from [email protected]
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
EPSS: 0.002970000 probability, percentile 0.224960000 (date 2026-11-09)
Problem Types: CWE-79 | CWE-79 CWE-79 Improper Neutralization of Input During Web Page Generation
| Version | Source | Type | Score | Severity | Vector |
|---|---|---|---|---|---|
| 3.1 | [email protected] | Secondary | 6.4 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
| 3.1 | CNA | DECLARED | 6.4 | MEDIUM | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
CVSS v3.1 Breakdown
Attack Vector
NetworkAttack Complexity
LowPrivileges Required
LowUser Interaction
NoneScope
ChangedConfidentiality
LowIntegrity
LowAvailability
NoneCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | John-dagelmore | WPSpeed WordPress Speed Cache Performance Optimization Core Web Vitals PageSpeed 100 | affected 2.6.10 semver | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| plugins.trac.wordpress.org/changeset/3771695/wpspeed/trunk/src/Core/LightImages.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/wpspeed/tags/2.6.10/src/Core/Optimize.php | [email protected] | plugins.trac.wordpress.org | |
| plugins.trac.wordpress.org/browser/wpspeed/tags/2.6.10/src/Dispatcher.php | [email protected] | plugins.trac.wordpress.org | |
| www.wordfence.com/threat-intel/vulnerabilities/id/47aa1a74-4189-4521-ba6e-e91a0... | [email protected] | www.wordfence.com | |
| plugins.trac.wordpress.org/browser/wpspeed/tags/2.6.10/src/Core/LightImages.php | [email protected] | plugins.trac.wordpress.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
Vendor Comments And Credit
Discovery Credit
CNA: poiri3r (en)
Additional Advisory Data
| Source | Time | Event |
|---|---|---|
| CNA | 2026-10-28T20:58:29.000Z | Vendor Notified |
| CNA | 2026-11-06T21:25:42.000Z | Disclosed |
There are currently no legacy QID mappings associated with this CVE.