CVE-2026-18937 — CRITICAL (9.0)

Vulnerability Description

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.

CVSS Score

9.0

CRITICAL

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

Attack Vector

NETWORK

Attack Complexity

HIGH

Privileges Required

NONE

User Interaction

NONE

Scope

CHANGED

Confidentiality

HIGH

Integrity

HIGH

Availability

HIGH

Related Weaknesses (CWE)

CWE-94

References

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

FAQ

What is CVE-2026-18937?

CVE-2026-18937 is a vulnerability with a CVSS score of 9.0 (CRITICAL). 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 arbi...

How severe is CVE-2026-18937?

CVE-2026-18937 has been rated CRITICAL with a CVSS base score of 9.0/10. This is considered a critical vulnerability requiring immediate attention.

Is there a patch for CVE-2026-18937?

Check the references section above for vendor advisories and patch information. Review vendor security bulletins for remediation guidance.