PHP2Shell flaws put PHP runtimes at risk; CISA adds both CVEs to KEV catalog
Two critical PHP interpreter vulnerabilities, CVE-2026-109618 and CVE-2026-109619, can enable unauthenticated remote code execution under certain conditions. The PHP project released fixes in versions 8.5.12, 8.4.27, 8.3.36, and 8.2.35 on October 21, 2026. CISA added both flaws to its Known Exploited Vulnerabilities catalog on October 26, 2026, signaling active exploitation. Separately, a session upload progress issue, CVE-2026-115560, was disclosed October 23 and is not fixed by the October 21 updates, with a configuration workaround advised. Experts urge organizations to inventory the PHP runtimes actually serving requests and restart workers after patching.
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