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CVE-2026-13424 is a stored cross-site scripting vulnerability in the Online Scheduling and Appointment Booking System – Bookly plugin for WordPress affecting all versions up to and including 27.7. The flaw is caused by insufficient input sanitization and output escaping in the unauthenticated bookly_speed_up_update_addons AJAX action. Because this action is exposed through a nopriv AJAX handler, an unauthenticated attacker can submit crafted input that is stored verbatim in the plugin's logging data. The malicious script is later rendered and executed when an administrator views the plugin's Diagnostics → Logs interface. The vulnerability therefore creates a persistent client-side execution path from an unauthenticated request into an administrative browser session.
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What an attacker gets, and what they’ve been doing with it.
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Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
7 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.