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CVE-2026-59856 is an arbitrary code execution vulnerability in Vim prior to version 9.2.0736. The flaw resides in the PHP omni-completion implementation in runtime/autoload/phpcomplete.vim, where a class or trait name extracted from the edited PHP buffer is interpolated into a search() pattern and executed through win_execute() without proper escaping. A maliciously crafted name containing a single quote can prematurely terminate the intended search() string, and the remaining content can be interpreted as Ex commands because the bar character is treated as a command separator. This enables execution of attacker-controlled Ex commands and, through the :! command, arbitrary operating-system command execution when a user opens a crafted PHP file and triggers omni-completion.
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No public exploit code observed for this vulnerability.
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
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