What’s Vulnerable › Vulnerabilities

CVE-2026-12157: BetterDocs <= 4.5.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'blockId' Block Attribute

• 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: 2026-06-19 · updated 2026-06-22
• Weakness: CWE-79

Description

The BetterDocs - Knowledge Base Docs & FAQ Solution for Elementor & Block Editor plugin for WordPress is vulnerable to Stored Cross-Site Scripting via the blockId attribute of the betterdocs/category-slate-layout Gutenberg block in versions up to, and including, 4.5.3. This is due to insufficient input sanitization and output escaping in the CategorySlateLayout::render() method, which echoes the blockId block attribute directly into an HTML class attribute without esc_attr(). 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

• wpdevteam BetterDocs – AI Documentation, Knowledge Base, Docs, Wikis, FAQ with Chatbot: through 4.5.3

References

• https://plugins.trac.wordpress.org/browser/betterdocs/tags/4.3.12/includes/Editors/BlockEditor/Blocks/CategorySlateLayout.php#L66
• https://plugins.trac.wordpress.org/browser/betterdocs/tags/4.3.12/includes/Editors/BlockEditor/Blocks/CategorySlateLayout.php#L97
• https://plugins.trac.wordpress.org/browser/betterdocs/tags/4.5.3/includes/Editors/BlockEditor/Blocks/CategorySlateLayout.php#L66
• https://plugins.trac.wordpress.org/browser/betterdocs/tags/4.5.3/includes/Editors/BlockEditor/Blocks/CategorySlateLayout.php#L97
• https://plugins.trac.wordpress.org/changeset?sfp_email=&sfph_mail=&reponame=&old=3576713%40betterdocs&new=3576713%40betterdocs&sfp_email=&sfph_mail=
• https://www.wordfence.com/threat-intel/vulnerabilities/id/81f61ef0-b3c7-4c69-bd18-5e5f0ea09abc?source=cve

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