PHP2Shell: critical PHP RCE flaws CVE-2026-109618/109619 patched; mass exploitation attempts, Potassium Mirai botnet, European sites offline; separate unpatched CVE-2026-115560 disclosed
The PHP security team released emergency fixes on October 21, 2026 for two critical core flaws, CVE-2026-109618 and CVE-2026-109619, nicknamed PHP2Shell. Both are rated CVSS v4.0 9.2 and allow unauthenticated remote code execution (RCE) as the web worker account. They can also expose process memory that may hold credentials and API keys (…