CVE-2026-42569 affects phpVMS, an open-source PHP application used by virtual airlines and flight simulation groups to manage airline operations. The vulnerability was publicly disclosed on May 9, 2026 with a CVSS score of 9.4 (Critical), though technical details and a full proof-of-concept have not been widely published as of the disclosure date. While phpVMS serves a niche simulation audience rather than mainstream enterprise environments, the critical severity warrants prompt patching for any organization hosting the software publicly. Administrators should check the phpVMS project repository for a patched release and restrict administrative access while awaiting an official fix if none is yet available.