
WordPress CVE-2026-87902: Critical Unauthenticated RCE Vulnerability Demands Immediate Action
WordPress released an emergency security patch on September 22, 2026, addressing CVE-2026-87902, a critical path traversal vulnerability affecting versions 4.7.0 through 7.1.1. The flaw allows unauthenticated attackers to force WordPress sites to load arbitrary PHP files from outside theme directories through manipulated URL parameters. On servers with specific configurations, particularly those running older PHP versions with register_argc_argv enabled and themes containing page- prefixed directories, this vulnerability can escalate to remote code execution. The vulnerability bypassed WordPress's built-in directory traversal protections in the template selection mechanism. This incident highlights the persistent threat of web application vulnerabilities in widely-deployed platforms, with WordPress powering over 40% of websites globally. The timing coincides with increased scrutiny of supply chain security and the growing sophistication of automated vulnerability exploitation frameworks targeting content management systems.
Kill Chain







