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CVE-2026-59989— Phalcon Volt compiler `join` filter compile-time PHP code injection (SSTI lead to RCE)

Quick assessment

Affected
phalcon cphalcon
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Phalcon 是一款高性能、全栈的 PHP 框架。在 5.15.0 及更早版本中， 中的 方法在构建 join 过滤器时，直接将原始分隔符和数组标记值插入生成的 PHP 代码中，而未经过 函数进行处理。攻击者若能影响 Volt 模板源代码，便可在 join 参数中注入包含引号破坏内容的代码，从而将恶意 PHP 代码注入编译后的缓存文件中。当 加载模板时，这些注入的代码将被执行。该漏洞已在版本 5.16.0 中得到修复。

CVSS 9.2 · Critical EPSS 0.31% · P24

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
phalcon cphalcon < 5.16.0 affected
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I. Basic Information for CVE-2026-59989

Vulnerability Information
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Vulnerability Title
Phalcon Volt compiler `join` filter compile-time PHP code injection (SSTI lead to RCE)
Source: CVE Program / CVE List V5
Vulnerability Description
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 / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
对生成代码的控制不恰当(代码注入)
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
phalcon cphalcon < 5.16.0 -

II. Public POCs for CVE-2026-59989

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 6956 chars
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III. Intelligence Information for CVE-2026-59989

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Patches & Fixes for CVE-2026-59989 (2)

Vendor Advisories for CVE-2026-59989 (1)

Vendor Pages for CVE-2026-59989 (1)

IV. Related Vulnerabilities

Same product: cphalcon
Same vendor: phalcon
Same weakness: CWE-94

V. Comments for CVE-2026-59989

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