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CVE-2025-9501 – PHP command injection in W3 Total Cache WordPress plugin

CVE-2025-9501 is a critical remote code-execution flaw in W3 Total Cache versions before 2.8.13. The issue stems from the _parse_dynamic_mfunc handler, which processes dynamic fragment callbacks in user comments without proper validation.
If a site runs a vulnerable version, has public posts, and allows anonymous comments, an attacker can submit a crafted comment containing a malicious mfunc payload that may lead to PHP code execution provided they can guess the internal dynamic_security value, which is brute-forceable.
The IONIX research team created detection logic that checks for the vulnerable plugin version, confirms public post access, and verifies whether anonymous comments are allowed. It does not attempt to brute-force the dynamic_security value. Potentially affected assets are listed in this post.

References:

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By combining context about software stack, versioning, exposure status, and reachability, IONIX ensures that only the right payloads are executed against the right assets, maximizing efficiency and minimizing risk.

6

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Results are routed through integrations with ticketing, SOAR, and SIEM tools. Issues are written in plain language, bundled into remediation clusters, and prioritized based on asset criticality, exploitability, and blast radius. This shortens mean time to remediation (MTTR) and empowers teams to act with confidence.

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