Vulnerability · Published Aug 19, 2026 · Assigned by WPScan

CVE-2026-18937Broken Link Checker < 2.4.12 - Unauthenticated RCE via Query Variable Injection

Critical 9.0

In plain English

A critical-severity code injection in Broken Link Checker from Unknown. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 2.0% (higher than 81% of all known vulnerabilities). Ready-made attack tooling exists: Nuclei, public proof-of-concept code.

Severity (CVSS 3.1)9.0Critical

Exploit odds (30 days)2.0%top 19.2% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack tooling2Nuclei, Public PoC

Official 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.

Affected products (as reported)

Vendor	Product	Versions
Unknown	Broken Link Checker	0 – before 2.4.12

Weakness: CWE-94 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H

References

https://wpscan.com/vulnerability/a23b76eb-107d-4e02-8eae-c3c5fa5b003d/ exploit, vdb-entry, technical-description