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CVE-2025-4684: BlockSpare: Gutenberg Blocks & Patterns for Blogs, Magazines, Business Sites <= 3.2.13.1 - Authenticated (Contributor+) Stored Cross-Site Scripting via Image Carousel and Image Slider Widgets

• Severity: medium (CVSS 6.4 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: 2025-08-01 · updated 2026-06-17
• Weakness: CWE-79

Description

The BlockSpare: Gutenberg Blocks & Patterns for Blogs, Magazines, Business Sites – Post Grids, Sliders, Carousels, Counters, Page Builder & Starter Site Imports, No Coding Needed plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the HTML attributes of Image Carousel and Image Slider widgets in all versions up to, and including, 3.2.13.1 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

• BlockSpare — News, Magazine and Blog Addons for (Gutenberg) Block Editor: through 3.2.13.1

References

• https://plugins.trac.wordpress.org/browser/blockspare/trunk/dist/blocks.js
• https://www.wordfence.com/threat-intel/vulnerabilities/id/0f4f8b84-3f65-430b-b749-6afae8d53153?source=cve

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