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Tool Directory

CVE-2026-18937

CriticalPublished

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

Published: Aug 19, 2026
Updated: Aug 19, 2026
Assigning CNA: WPScan
Evidence observed: Sep 19, 2026

Primary CVSS

9.0/ 10Critical

nvd · CVSS 3.1

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

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 33.5%
Model date: Sep 20, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

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) is active.

Sources

CVE-2026-18937PoC
Proof-of-concept exploit and lab reproduction pack for CVE-2026-18937, an unauthenticated RCE in the Broken Link Checker WordPress plugin before 2.4.12.

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