What is the CVSS score of CVE-2026-3279?

CVE-2026-3279 has a CVSS 3.1 base score of 6.5 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N. EPSS exploitation probability: 0.0%.

Enable jQuery Migrate Helper CVE-2026-3279

EUVD-2026-32099 MEDIUM

Missing Authorization (CWE-862)

2026-05-27 security@wordfence.com

GHSA-hcmf-56qp-ghh2

WordPress Authentication Bypass

6.5

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

6.5 MEDIUM

AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Lifecycle Timeline

Analysis Generated

May 27, 2026 - 22:18 vuln.today

CVE Published

May 27, 2026 - 08:16 nvd

MEDIUM 6.5

DescriptionCVE.org

The Enable jQuery Migrate Helper plugin for WordPress is vulnerable to unauthorized modification of data due to a missing capability check on the downgrade_jquery_version() function in all versions up to, and including, 1.4.1. This is due to the function only verifying a nonce without checking user capabilities. This makes it possible for authenticated attackers, with Subscriber-level access and above, to downgrade the site-wide jQuery version from 3.7.1 to the legacy 1.12.4-wp release, which has knowns security vulnerabilities.

AnalysisAI

Unauthorized jQuery downgrade in the Enable jQuery Migrate Helper WordPress plugin (all versions ≤1.4.1) allows any authenticated Subscriber-level user to replace the site-wide jQuery 3.7.1 with the legacy 1.12.4-wp release, which carries known security vulnerabilities. The root cause is a missing authorization check in the downgrade_jquery_version() function, which validates a nonce but never verifies user capabilities (CWE-862). No public exploit exists and CISA has not added this to KEV; however, the indirect impact is significant because a successful downgrade introduces a vulnerable jQuery version that could serve as a stepping stone for further exploitation of other weaknesses.

Technical ContextAI

The Enable jQuery Migrate Helper WordPress plugin provides site administrators a compatibility bridge between legacy jQuery code and modern jQuery releases. The affected function downgrade_jquery_version() - defined at class-jquery-migrate-helper.php line 225 and referenced at line 256 - uses WordPress nonce verification (wp_verify_nonce) as its sole authorization gate. WordPress nonces prevent CSRF but do not enforce privilege separation; capability checks (current_user_can()) are the correct mechanism for restricting privileged actions. CWE-862 (Missing Authorization) captures exactly this pattern: authentication is present but authorization is absent. The practical consequence is that the function can be invoked by any authenticated user regardless of role - Subscriber through Administrator - causing a site-wide regression from jQuery 3.7.1 to jQuery 1.12.4-wp, a legacy release with documented security issues. CVSS vector AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:N reflects network-reachable exploitation, low complexity, low privilege requirement, and high integrity impact with no confidentiality or availability effect in isolation.

RemediationAI

The NVD references include both the 1.4.1 tagged release and the trunk branch of the plugin repository (plugins.trac.wordpress.org/browser/enable-jquery-migrate-helper/trunk/class-jquery-migrate-helper.php), suggesting an upstream fix has been committed to trunk, but a specifically versioned patched release was not confirmed in the available input data - administrators should check the WordPress plugin repository for an update released after 1.4.1 and apply it immediately. As a compensating control while awaiting a confirmed patched release, restrict WordPress user registration to prevent creation of Subscriber-level accounts by untrusted parties (Settings → General → uncheck 'Anyone can register'). Alternatively, a WAF rule blocking POST requests to the wp-admin AJAX endpoint targeting the downgrade action can limit exposure. Disabling the plugin entirely eliminates the attack surface at the cost of losing jQuery migrate compatibility tooling. The Wordfence advisory at wordfence.com/threat-intel/vulnerabilities/id/1a74d5f4-1dd8-4d49-b4ce-8ba7ac9cbcc7 should be monitored for patch version confirmation.