Cyber Resilience

CVE-2026-39466

High

Published: 08 April 2026

Published
08 April 2026
Modified
24 April 2026
KEV Added
—
Patch
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CVSS Score v3.1 7.6 CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:L
EPSS Score 0.0004 12.1th percentile
Risk Priority 15 60% EPSS · 20% KEV · 20% CVSS

Summary

CVE-2026-39466 is a high-severity SQL Injection (CWE-89) vulnerability. Its CVSS base score is 7.6 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 12.1th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

The strongest mitigations our analysis identified are NIST 800-53 SI-10 (Information Input Validation) and SI-2 (Flaw Remediation).

Deeper analysis

CVE-2026-39466 is an Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability, specifically enabling Blind SQL Injection, in the Broken Link Checker plugin from WPMU DEV, a WordPress platform. The flaw affects Broken Link Checker versions from n/a through 2.4.7. It has a CVSS v3.1 base score of 7.6 (AV:N/AC:L/PR:H/UI:N/S:C/C:H/I:N/A:L) and is associated with CWE-89.

The vulnerability can be exploited over the network with low complexity and no user interaction, but requires high privileges (PR:H), such as those held by authenticated administrators. Successful exploitation changes scope (S:C) and primarily allows high-impact confidentiality violations (C:H), enabling attackers to extract sensitive data from the database via blind SQL injection techniques, with low availability impact (A:L) and no integrity impact.

The Patchstack advisory at https://patchstack.com/database/Wordpress/Plugin/broken-link-checker/vulnerability/wordpress-broken-link-checker-plugin-2-4-7-sql-injection-vulnerability?_s_id=cve provides details on the vulnerability, including potential patches or mitigation steps for affected WordPress installations.

EU & UK References

Vulnerability details

Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection') vulnerability in WPMU DEV - Your All-in-One WordPress Platform Broken Link Checker broken-link-checker allows Blind SQL Injection.This issue affects Broken Link Checker: from n/a through <= 2.4.7.

CWE(s)
CWE-89

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1213.006 Databases Collection
Adversaries may leverage databases to mine valuable information.
attack.mitre.org →
Why these techniques?

SQL injection vulnerability in public-facing WordPress plugin directly enables exploitation of the web application (T1190) and facilitates extraction of sensitive data from the backend database (T1213.006).

Confidence: HIGH · MITRE ATT&CK Enterprise v18.1

CVEs Like This One

CVE-2019-25537Shared CWE-89
CVE-2019-25366Shared CWE-89
CVE-2019-25496Shared CWE-89
CVE-2026-1475Shared CWE-89
CVE-2026-26990Shared CWE-89
CVE-2026-44047Shared CWE-89
CVE-2025-12865Shared CWE-89
CVE-2024-11135Shared CWE-89
CVE-2019-25491Shared CWE-89
CVE-2024-13369Shared CWE-89

Affected Assets

Mitigating Controls

Mitigating Controls (NIST 800-53 r5) AI

SI-10 Information Input Validation good match
prevent

Directly addresses improper neutralization of special elements in SQL commands by requiring validation of all information inputs to prevent blind SQL injection exploitation.

SI-2 Flaw Remediation good match
prevent

Mandates timely identification, reporting, and remediation of flaws like CVE-2026-39466 in the Broken Link Checker plugin to eliminate the SQL injection vulnerability.

AC-6 Least Privilege partial match
prevent

Enforces least privilege to limit exploitation opportunities requiring high privileges (PR:H), reducing the number of accounts able to trigger the blind SQL injection.

References