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CISA Confirms Active Exploitation of Two PHP2Shell Flaws Enabling Remote Code Execution

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CISA Confirms Active Exploitation of Two PHP2Shell Flaws Enabling Remote Code Execution

The U.S. Cybersecurity and Infrastructure Security Agency (CISA) on Monday confirmed active exploitation of the recently patched PHP2Shell flaws by adding them to its Known Exploited Vulnerabilities (KEV) catalog.

The PHP vulnerabilities, both rated 9.2 on the CVSS scoring system, facilitate unauthenticated remote code execution on affected deployments -

The addition of the two flaws to the KEV catalog comes after Adel Karimi, detection and response lead at Perplexity, confirmed successful instances of remote code execution against honeypot systems on October 24, 2026.

"This is now confirmed RCE with usable memory disclosure, not just a crash followed by a suspicious process," Karimi said. "The response delivered an 800 KiB decoded cookie dump, and a function address derived from that dump using the public exploit's offsets appears in the subsequent execution payload."

"The evidence demonstrates this chain on the intentionally favorable single-worker mod_php profile; it is not a measurement of exploit reliability on other worker counts, PHP builds, or applications."

The issues have been addressed in PHP versions 8.5.12, 8.4.27, 8.3.36, and 8.2.35 released on October 21, 2026. Federal agencies have time until October 29, 2026, to apply the necessary fixes.

PHP, short for PHP: Hypertext Preprocessor, is a server-side scripting language used in roughly 70% of all websites on the internet. According to estimates shared by Censys, more than 32.51 million PHP services are still running an affected version.

The severity of the vulnerabilities has prompted numerous advisories from software and security vendors and government agencies across the world, including -


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