CVE-2026-59989 — Phalcon Volt compiler `join` filter compile-time PHP code injection (SSTI lead to RCE)
Phalcon is a high-performance, full-stack PHP framework. In 5.15.0 and earlier, resolveFilter in phalcon/Mvc/View/Engine/Volt/Compiler.zep builds the join filter by inserting th…
Published: 2026-08-21 · CVSS: 9.2 · CVSS 4.0
Phalcon is a high-performance, full-stack PHP framework. In 5.15.0 and earlier, resolveFilter in phalcon/Mvc/View/Engine/Volt/Compiler.zep builds the join filter by inserting the raw separator and array token values into generated PHP without passing them through expression(). An attacker who can influence Volt template source can place quote-breaking content in a join argument, inject PHP into the compiled cache file, and execute it when Phalcon\Mvc\View\Engine\Volt::render() loads the template. This issue is fixed in version 5.16.0.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7