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PHP shares mitigation for new RCE vulnerability with no patch - Bleeping Computer​

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The PHP security team has shared mitigation measures for a new remote code execution vulnerability that affects systems with non-default configurations and has no patch.

PHP is an open-source web development language used by nearly 70% of all websites on the Internet. According to VirusTotal estimates, more than 5.1 million PHP hosts are exposed online, and roughly 3.8 million have at least one port open to attacks.

According to a Friday advisory, this security flaw (tracked as CVE-2026-115560) can only be exploited when targeting systems "with an unusual combination of configuration and application code."

"An application must set session.serialize_handler to php_binary or php_serialize in its configuration and then switch it to php at runtime with ini_set() before calling session_start(). Session upload progress must also still be enabled," the PHP team explained.

"Applications that never change the serialize handler at runtime can keep the feature enabled. Since this setup is unlikely in practice, we are handling it in the regular release cycle and will publish a full advisory for CVE-2026-115560 with the next release."

Until a security patch is available, the PHP devs suggested setting session.upload_progress.enabled=0, adding that "If you applied it then, keep it in place and no further action is needed."

This mitigation should have already been applied on Wednesday, before patching two other critical RCE vulnerabilities (CVE-2026-109618 and CVE-2026-109619) tracked collectively as PHP2Shell.

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