CVE-2024-4268
Ultimate Blocks – WordPress Blocks Plugin <= 3.1.9 - Authenticated(Contributor+) Stored Cross-Site Scripting via Multiple Blocks
CVSS Score
6.4
EPSS Score
0.0%
EPSS Percentile
0th
The Ultimate Blocks – WordPress Blocks Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the plugin's blocks in all versions up to, and including, 3.1.9 due to insufficient input sanitization and output escaping on user supplied attributes. 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. CVE-2024-37457 may be a duplicate of this issue.
| CWE | CWE-79 |
| Vendor | ultimateblocks |
| Product | ultimate blocks – 25+ gutenberg blocks for block editor |
| Published | Jul 2, 2024 |
| Last Updated | Apr 8, 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
ultimateblocks / Ultimate Blocks – 25+ Gutenberg Blocks for Block Editor
0 ≤ 3.1.9
References
wordfence.com: https://www.wordfence.com/threat-intel/vulnerabilities/id/00b60b53-77bf-4640-bf2b-84e011014623?source=cve plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/ultimate-blocks/trunk/src/blocks/advanced-heading/block.php plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/ultimate-blocks/trunk/src/blocks/styled-box/block.php plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/ultimate-blocks/trunk/src/blocks/how-to/block.php plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/ultimate-blocks/trunk/src/blocks/image-slider/block.php plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/ultimate-blocks/trunk/src/blocks/testimonial/block.php plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/changeset/3075315/ultimate-blocks plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/browser/ultimate-blocks/trunk/src/extensions/custom-css/class-custom-css.php?rev=3102541#L173 plugins.trac.wordpress.org: https://plugins.trac.wordpress.org/changeset/3108401/ wordpress.org: https://wordpress.org/plugins/ultimate-blocks/#developers gist.github.com: https://gist.github.com/webber-naut/0a8a4f810da286392a43c4614d31712e dropbox.com: https://www.dropbox.com/scl/fi/zh7t1qsvxkxk2dfhwd7nn/Ultimate-Blocks-Stored-XSS_POC_4.20.24.mov?rlkey=ws16dcu7f6mjd3h9emsqev7jm&e=2&st=fdr7q9h7&dl=0
Credits
Craig Smith