SEPTEMBER 18, 2026
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Case File

CVE-2026-15421

MEDIUM · CVSS 6.4 EPSS 0.30% Public Exploit

Source: NVD + CISA KEV + EPSS · Published 2026-08-19 · Last synced 2026-09-18

CyberRota Analysis

AI-Generated

The Speed Optimizer plugin for WordPress is susceptible to Stored Cross-Site Scripting (XSS) due to inadequate input sanitization and output escaping, affecting all versions up to 7.8.0. Authenticated attackers with contributor-level access can exploit this vulnerability to inject malicious scripts into web pages, which execute when users visit those pages, particularly if the Lazy Load Media option is enabled. WordPress site administrators and users of this plugin should prioritize applying updates to mitigate potential security risks.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

Detected Signals
exploit

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2026-15421
Severity
MEDIUM
CVSS
6.4
EPSS
0.30%
WordPress

Original NVD Description

The Speed Optimizer – The All-In-One Performance-Boosting Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Image Tag Attributes in all versions up to, and including, 7.8.0 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page. This is only exploitable when the site administrator has enabled the Lazy Load Media option in the plugin settings.