CVE-2026-18937
CriticalCVSS 9.0Exploitation Probability (EPSS)
Low risk13th percentile - higher than 13% of all known CVEs
Summary
The Broken Link Checker WordPress plugin before 2.4.12 does not limit which query variables it accepts from user input on sites using plain permalinks, allowing unauthenticated users to overwrite arbitrary PHP global variables, and to execute arbitrary code on the server when a classic (non-block) editor is active.
Risk Assessment
An unauthenticated attacker can execute arbitrary code on the server, leading to full compromise of the site and potentially the entire server.
Recommendation
Update the Broken Link Checker plugin to version 2.4.12 or later. If possible, enable permalinks other than plain (e.g., pretty permalinks).
Original NVD description (English source)
The Broken Link Checker WordPress plugin before 2.4.12 does not limit which query variables it accepts from user input on sites using plain permalinks, allowing unauthenticated users to overwrite arbitrary PHP global variables, and to execute arbitrary code on the server when a classic (non-block) is active.