What’s Vulnerable › Vulnerabilities

CVE-2025-2918: Ultimate Blocks – WordPress Blocks Plugin <= 3.3.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via Multiple Widgets

• Severity: medium (CVSS 5.4 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-06-10 · updated 2026-06-17
• Weakness: CWE-79

Description

The Ultimate Blocks – WordPress Blocks Plugin plugin for WordPress is vulnerable to Stored Cross-Site Scripting via multiple widgets in all versions up to, and including, 3.3.3 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.

Affected products

• ultimateblocks Ultimate Blocks – 25+ Gutenberg Blocks for Block Editor: before 3.3.4 — fixed in 3.3.4

How to fix

Upgrade to a fixed version: ultimateblocks Ultimate Blocks – 25+ Gutenberg Blocks for Block Editor 3.3.4. Check the vendor advisory for mitigations.

References

• https://plugins.trac.wordpress.org/browser/ultimate-blocks/tags/3.2.9/src/blocks/content-filter/block.php#L14
• https://plugins.trac.wordpress.org/browser/ultimate-blocks/tags/3.2.9/src/blocks/content-toggle/block.php#L133
• https://plugins.trac.wordpress.org/browser/ultimate-blocks/tags/3.2.9/src/blocks/how-to/block.php#L335
• https://plugins.trac.wordpress.org/browser/ultimate-blocks/tags/3.2.9/src/blocks/tabbed-content/block.php#L136
• https://www.wordfence.com/threat-intel/vulnerabilities/id/41b2a4cc-fb23-41eb-b1a4-d793ae924d9a?source=cve

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