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CVE-2026-4001 is a remote code execution vulnerability in the WooCommerce Custom Product Addons Pro plugin for WordPress affecting all versions up to and including 5.4.1. The flaw is in the custom pricing formula handling implemented by process_custom_formula() in includes/process/price.php, where user-influenced input is passed to PHP's eval(). According to the provided content, input sanitization is insufficient: sanitize_values() strips HTML tags but does not escape single quotes or otherwise prevent PHP code injection. As a result, attacker-controlled data supplied through a WCPA text field can break out of the intended formula context and inject arbitrary PHP code when the field is configured for custom pricing using pricingType: "custom" with {this.value}.
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No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
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11 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.