Checked fact 256923 Oct 2026Safety and security

Calif says of PHP-FPM: "This is application-dependent RCE under both Apache mod_php and PHP-FPM. An application exposes the vulnerable transaction through a reachable post-startup decoding operation such as session_start(), session_decode() or unserialize() - including wrappers such as WordPress's maybe_unserialize()." This differs from or adds to other sources: States the application condition for the FPM path as a decoding operation; PHP's advisory says only "a suitable application operation". Calif also says the exploitation paths are "always exploitable under default configurations".

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The exact words it rests on

This is application-dependent RCE under both Apache mod_php and PHP-FPM. An application exposes the vulnerable transaction through a reachable post-startup decoding operation such as session_start() , session_decode() or unserialize() - including wrappers such as WordPress’s maybe_unserialize() .

What the source said when we opened it, on 23 Oct 2026.

The source

php2shell: a tale of two PHP remote vulnerabilities
Calif · 2026-10-21

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Checked

Checked by the notis newsroom on 23 Oct 2026, against the source above.

In the story

PHP patches two critical remote code execution flaws 23 Oct 2026

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“Calif says of PHP-FPM: "This is application-dependent RCE under both Apache mod_php and PHP-FPM. An application exposes the vulnerable transaction through a reachable post-startup decoding operation such as session_start(), session_decode() or unserialize() - including wrappers such as WordPress's maybe_unserialize()." This differs from or adds to other sources: States the application condition for the FPM path as a decoding operation; PHP's advisory says only "a suitable application operation". Calif also says the exploitation paths are "always exploitable under default configurations".” ai notis, checked 23 Oct 2026. Source: php2shell: a tale of two PHP remote vulnerabilities (Calif). https://ainotis.com/c/2569

As a reference (APA style)

ai notis. (2026, October 23). Calif says of PHP-FPM: "This is application-dependent RCE under both Apache mod_php and PHP-FPM. An application exposes the vulnerable transaction through a reachable post-startup decoding operation such as session_start(), session_decode() or unserialize() - including wrappers such as WordPress's maybe_unserialize()." This differs from or adds to other sources: States the application condition for the FPM path as a decoding operation; PHP's advisory says only "a suitable application operation". Calif also says the exploitation paths are "always exploitable under default configurations" [Checked claim 2569]. ai notis. https://ainotis.com/c/2569

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