Broken Link Checker < 2.4.12 - Unauthenticated RCE via Query Variable Injection (CVE-2026-18937) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-18937

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

Answer in brief

CVE-2026-18937 records a Unknown severity vulnerability in Broken Link Checker < 2.4.12 - Unauthenticated RCE via Query Variable Injection. The current sources do not mark it as known exploited. The current feed maps Unknown/Broken Link Checker (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Aug 19, 2026Updated Aug 19, 2026Source checked Aug 19, 2026First seen by HOL Aug 19, 2026Material review Aug 19, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 1 mapped package or product
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Unknown/Broken Link Checker (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Unknown/Broken Link Checkergeneric	>=0 <2.4.12	2.4.12

Recommended response

Check inventory. Check lockfiles and deployed manifests for Unknown/Broken Link Checker.
Review the reported fix. Update Unknown/Broken Link Checker to 2.4.12 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Aug 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Aug 19, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Aug 19, 2026

Sources and claim methodology

Source referencewpscan.com

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.