Critical PHP Vulnerabilities Exploited Before Public Disclosure

• •CVE-2026-109618 and CVE-2026-109619 allow unauthenticated RCE with a CVSS score of 9.2.
• •Exploitation attempts were detected four days before the vulnerabilities were publicly disclosed.
• •Patches were released on October 21, 2026, but exploitation continued immediately after.

Two critical vulnerabilities in PHP, tracked as CVE-2026-109618 and CVE-2026-109619, were exploited before their public disclosure on October 21, 2026. Amazon Threat Intelligence reported that attempts to exploit these vulnerabilities began on October 17, 2026, targeting its MadPot honeypot network. Both vulnerabilities allow unauthenticated remote code execution (RCE) and have a CVSS score of 9.2. The attack vector involves the `session.upload_progress` feature in PHP, which can be manipulated to execute arbitrary code. Patches were released on October 21, 2026, but exploitation attempts continued shortly after the fixes were made public. The vulnerabilities affect multiple PHP versions, including those that are no longer supported. Organizations are urged to apply the patches immediately and review their systems for potential exposure.