What is the CVSS score of CVE-2026-2951?

CVE-2026-2951 has a CVSS 3.1 base score of 5.4 (Medium). CVSS vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N. EPSS exploitation probability: 0.0%.

Gutentor - Gutenberg Blocks CVE-2026-2951

EUVD-2026-25168 MEDIUM

Cross-site Scripting (XSS) (CWE-79)

2026-04-23 Wordfence

GHSA-vrq9-2rh7-jjg5

WordPress XSS

5.4

CVSS 3.1 · NVD

Severity by source

NVD PRIMARY

5.4 MEDIUM

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

Primary rating from NVD · only source for this CVE.

CVSS VectorNVD

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

Required

Scope

Changed

Confidentiality

Low

Integrity

Low

Availability

None

Lifecycle Timeline

Analysis Generated

Apr 23, 2026 - 07:07 vuln.today

EUVD ID Assigned

Apr 23, 2026 - 02:45 euvd

EUVD-2026-25168

Analysis Generated

Apr 23, 2026 - 02:45 vuln.today

CVE Published

Apr 23, 2026 - 02:25 nvd

MEDIUM 5.4

DescriptionCVE.org

The Gutentor - Gutenberg Blocks - Page Builder for Gutenberg Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting in versions up to, and including, 3.5.5 due to insufficient input sanitization and output escaping. This makes it possible for authenticated attackers, with contributor-level access and above, to inject arbitrary web scripts in pages that will execute whenever a user accesses an injected page.

AnalysisAI

Stored Cross-Site Scripting in Gutentor plugin for WordPress up to version 3.5.5 allows authenticated contributors and above to inject malicious scripts into pages via insufficient input sanitization, executing arbitrary JavaScript in the browsers of users who view the compromised pages. The vulnerability requires contributor-level WordPress account access and user interaction (page view), resulting in limited but real risk to website content integrity and user session compromise.

Technical ContextAI

Gutentor is a WordPress plugin providing a Gutenberg block editor interface for page building. The vulnerability stems from CWE-79 (Improper Neutralization of Input During Web Page Generation), specifically inadequate sanitization of user input when saving block content and insufficient escaping of stored data during page rendering. Contributors and higher-privileged users can embed JavaScript through block parameters or content fields, which is later rendered unescaped in the DOM when other users access pages containing the malicious blocks. The WordPress plugin architecture allows authenticated users with 'contributor' role to create and modify post content by default, making this a post-creation/modification vector rather than pure unauthenticated XSS.

RemediationAI

Update Gutentor to version 3.5.6 or later immediately. The patch is available via WordPress.org plugin directory and GitHub (WordPress plugin changeset 3495930 contains the fix). On WordPress dashboard, navigate to Plugins, find Gutentor, and click 'Update Now'. No workarounds mitigate the vulnerability post-deployment; compensation requires restricting contributor access to trusted users only (reduce PR:L scope by removing contributor role from untrusted accounts) or temporarily disabling the plugin until patched. If contributor access is necessary, audit all published pages created by recently-added contributors for injected scripts (search for '<script', 'javascript:', 'onerror=', etc. in page block meta and content). Note that downgrading contributor permissions may impact legitimate workflow.