EUVD-2026-26209Severity by source
AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Network-reachable stored XSS requiring no auth to inject but victim page-load for execution; scope change reflects browser-context payload execution with low C and I impact.
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
3DescriptionCVE.org
The WP Meteor Website Speed Optimization Addon plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the 'frontend_rewrite' function's 'WPMETEOR[N]WPMETEOR' placeholder content in all versions up to, and including, 3.4.16 due to insufficient input sanitization and output escaping. This makes it possible for unauthenticated attackers to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.
AnalysisAI
Stored Cross-Site Scripting in WP Meteor Website Speed Optimization Addon for WordPress (all versions through 3.4.16) allows unauthenticated attackers to permanently inject arbitrary JavaScript into pages via the WPMETEOR[N]WPMETEOR placeholder processed by the frontend_rewrite function. The injected script executes in the browser of any user who subsequently visits the compromised page, enabling session hijacking, credential theft, or malicious redirects. No active exploitation is confirmed (SSVC: none; EPSS 0.07%, 21st percentile), though unauthenticated stored XSS with a scope change carries meaningful real-world risk on publicly accessible WordPress sites.
Technical ContextAI
WP Meteor optimizes WordPress page delivery by rewriting frontend output through its Rewrite.php pipeline (frontend/Rewrite.php:43) and a request-blocking layer (blocker/FirstInteraction/UltimateReorder.php:68,186). During this rewrite process, the plugin uses a WPMETEOR[N]WPMETEOR placeholder to mark content segments for later substitution. Because user-influenced content flowing through this placeholder is neither sanitized on input nor escaped on output, CWE-79 (Improper Neutralization of Input During Web Page Generation) applies directly. The CPE cpe:2.3:a:aguidrevitch:wp_meteor_website_speed_optimization_addon:*:*:*:*:*:*:*:* confirms the vendor is aguidrevitch and all versioned releases of the plugin are within scope. The stored nature of the flaw means the malicious payload persists server-side and fires for every subsequent page visitor without any repeated attacker interaction.
RemediationAI
An upstream code fix has been committed to the WordPress plugin repository and is visible in changeset 3466538 at https://plugins.trac.wordpress.org/changeset/3466538/; the exact patched release version number is not independently confirmed from available data, so administrators should update the WP Meteor plugin to the latest available version in the WordPress Plugin Directory and verify the changeset is included. As a compensating control pending upgrade, administrators can deactivate the WP Meteor plugin entirely, which eliminates all attack surface at the cost of losing frontend speed optimizations. There is no known partial configuration toggle that disables only the vulnerable rewrite pathway without disabling the plugin. Site operators using a Web Application Firewall (WAF) with XSS filtering rules (e.g., Wordfence, Cloudflare) may gain partial mitigation but should not rely on WAF filtering alone as a substitute for patching.
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External POC / Exploit Code
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