Phalcon up to 5.15.0 Volt Compiler.zep resolveFilter join code injection

Summaryinfo

A vulnerability labeled as critical has been found in Phalcon up to 5.15.0. Affected by this issue is the function Phalcon\Mvc\View\Engine\Volt\Compiler::resolveFilter of the file phalcon/Mvc/View/Engine/Volt/Compiler.zep of the component Volt. Such manipulation of the argument join leads to code injection. This vulnerability is listed as CVE-2026-59989. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in Phalcon up to 5.15.0. It has been rated as critical. Affected by this issue is the function Phalcon\Mvc\View\Engine\Volt\Compiler::resolveFilter of the file phalcon/Mvc/View/Engine/Volt/Compiler.zep of the component Volt. The manipulation of the argument join with an unknown input leads to a code injection vulnerability. Using CWE to declare the problem leads to CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. Impacted is confidentiality, integrity, and availability. CVE summarizes:

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.

The advisory is shared for download at github.com. This vulnerability is handled as CVE-2026-59989 since 07/07/2026. The exploitation is known to be easy. The attack may be launched remotely. There are known technical details, but no exploit is available. The MITRE ATT&CK project declares the attack technique as T1059.

Upgrading to version 5.16.0 eliminates this vulnerability.

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Productinfo

Name

• Phalcon

Version

• 5.0
• 5.1
• 5.2
• 5.3
• 5.4
• 5.5
• 5.6
• 5.7
• 5.8
• 5.9
• 5.10
• 5.11
• 5.12
• 5.13
• 5.14
• 5.15.0

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