CVE-2026-12157 json
BetterDocs <= 4.5.3 - Authenticated (Contributor+) Stored Cross-Site Scripting via 'blockId' Block Attribute
published 2026-06-19 4 mo ago modified 2026-06-22 4 mo ago also EUVD-2026-37982
- cvss
- 6.4
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 28%
- public exploits
- 0
- none known
Summary
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.
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 4 mo ago
Exploit prediction
0.35% chance of exploitation in the next 30 days, higher than 28% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.4 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N |
Affected products
- wpdevteam BetterDocs – AI Documentation, Knowledge Base, Docs, Wikis, FAQ with Chatbot
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
- Technology feeds
References
- wordfence.com /threat-intel/vulnerabilities/id/81f61ef0-b3c7-4c69-bd18-5e5f0ea09abc?source=cve
- plugins.trac.wordpress.org /browser/betterdocs/tags/4.5.3/includes/Editors/BlockEditor/Blocks/CategorySlateLayout.php#L97
- plugins.trac.wordpress.org /browser/betterdocs/tags/4.5.3/includes/Editors/BlockEditor/Blocks/CategorySlateLayout.php#L66
- plugins.trac.wordpress.org /browser/betterdocs/tags/4.3.12/includes/Editors/BlockEditor/Blocks/CategorySlateLayout.php#L97
- plugins.trac.wordpress.org /browser/betterdocs/tags/4.3.12/includes/Editors/BlockEditor/Blocks/CategorySlateLayout.php#L66
- plugins.trac.wordpress.org /changeset?sfp_email=&sfph_mail=&reponame=&old=3576713%40betterdocs&new=3576713%40betterdocs&sfp_email=&sfph_m
Sources
- CVE List CVE-2026-12157
- NVD CVE-2026-12157
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.