🚨 PHPOffice PhpSpreadsheet CRITICAL vuln (CVE-2026-34084): RCE & SSRF possible via user input to IOFactory::load() (phar://, ftp://, ssh2.sftp://). Affected: v1.x – 5.5.0. Upgrade to a fixed version now! https://radar.offseq.com/threat/cve-2026-34084-cwe-502-deserialization-of-untruste-a9be2322 #OffSeq #CVE202634084 #infosec #php