by Kastro
Paper/Archive/CVE-2026-18937

CVE-2026-18937

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

EPSS 2%CVSS 9.0
critical.is priorityof 100
43
CVSS 9.0 (ADP)9.0 / 10 × 3027.0Not in CISA KEV+300.0EPSS percentile 80.7.807 × 2016.1No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
Broken Link Checker< 2.4.122.4.12CNA

Scores by source

CISA ADP9.0CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:H/I:H/A:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: total

References

exploitwpscan.com/vulnerability/a23b76eb-107d-4e02-8eae-c3c5fa5b003d