CVE-2026-18937

Broken Link Checker < 2.4.12 - Unauthenticated RCE via Query Variable Injection

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.

Affected

Broken Link Checker

CVSS v3.1 CNA

9.0 CRITICALCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

EPSS

0.54% chance of exploitation in the next 30 days, 44th percentile

Published

2026-08-19

Proof-of-concept exploits (1)

• https://wpscan.com/vulnerability/a23b76eb-107d-4e02-8eae-c3c5fa5b003d/

References

• CVE Record
• NVD entry