CVE-2026-12900

Received Received - Intake

Stored XSS in Spectra Gutenberg Blocks WordPress Plugin

Publication date: 2026-07-20

Last updated on: 2026-07-20

Assigner: Wordfence

Description

The Spectra Gutenberg Blocks – Website Builder for the Block Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the `uagb/image` block in all versions up to, and including, 2.19.28 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.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-07-20

Last Modified

2026-07-20

Generated

2026-07-21

AI Q&A

2026-07-21

EPSS Evaluated

N/A

NVD

CVE-2026-12900

EUVD

EUVD-2026-46114

Affected Vendors & Products

Vendor	Product	Version / Range
ultimate_addons_for_gutenberg	spectra_gutenberg_blocks	to 2.19.28 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-79	The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

Attack-Flow Graph

Executive Summary

This is a Stored Cross-Site Scripting (XSS) vulnerability in the Spectra Gutenberg Blocks WordPress plugin. It allows authenticated attackers with Contributor-level access or higher to inject malicious scripts via the uagb/image block. The issue stems from insufficient input sanitization and output escaping, enabling script execution when users view infected pages.

Detection Guidance

This vulnerability can be detected by checking if the Spectra Gutenberg Blocks plugin version is 2.19.28 or lower. Inspect WordPress installations for the plugin and verify its version. No specific commands are provided in the context.

Impact Analysis

If exploited, this vulnerability could allow attackers to steal user sessions, deface websites, or redirect visitors to malicious sites. Users with Contributor access or above could compromise site visitors, including administrators, by injecting scripts that execute in their browsers.

Compliance Impact

This vulnerability could lead to non-compliance with GDPR or HIPAA by exposing user data through script injection. GDPR requires protecting personal data, while HIPAA mandates safeguarding health information. A successful exploit may violate these regulations, potentially resulting in legal penalties or fines.

Mitigation Strategies

Immediately update the Spectra Gutenberg Blocks plugin to the latest version beyond 2.19.28. Remove or restrict Contributor-level access to untrusted users to limit attack vectors. Regularly audit user roles and permissions.

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