CVE-2026-12900
Spectra Gutenberg Blocks <= 2.19.28 - Authenticated (Contributor+) Stored Cross-Site Scripting via uagb/image Block
CVSS Score
6.4
EPSS Score
0.0%
EPSS Percentile
0th
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.
| CWE | CWE-79 |
| Vendor | brainstormforce |
| Product | spectra legacy – gutenberg blocks |
| Published | Jul 20, 2026 |
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CVSS v3 Breakdown
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality
Integrity
Availability
Affected Versions
brainstormforce / Spectra Legacy – Gutenberg Blocks
0 ≤ 2.19.28
References
wordfence.com: https://www.wordfence.com/threat-intel/vulnerabilities/id/0e9dc5e3-9d72-4c04-8ba9-56428a6fdddd?source=cve plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/ultimate-addons-for-gutenberg/tags/2.19.28/blocks-config/image/class-uagb-image.php#L59 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/ultimate-addons-for-gutenberg/tags/2.19.28/includes/blocks/image/block.php#L10
Credits
theviper17y