wpdevteam BetterDocs Plugin up to 4.5.3 on WordPress Block Attribute render blockId cross site scripting

Summaryinfo

A vulnerability has been found in wpdevteam BetterDocs Plugin up to 4.5.3 on WordPress and classified as problematic. Impacted is the function CategorySlateLayout::render of the component Block Attribute Handler. Performing a manipulation of the argument blockId results in cross site scripting. This vulnerability was named CVE-2026-12157. The attack may be initiated remotely. There is no available exploit. The affected component should be upgraded.

Detailsinfo

A vulnerability, which was classified as problematic, was found in wpdevteam BetterDocs Plugin up to 4.5.3 on WordPress. This affects the function CategorySlateLayout::render of the component Block Attribute Handler. The manipulation of the argument blockId with an unknown input leads to a cross site scripting vulnerability. CWE is classifying the issue as CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. This is going to have an impact on integrity. The summary by CVE is:

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.

The weakness was presented by Smidi. The advisory is shared at wordfence.com. This vulnerability is uniquely identified as CVE-2026-12157 since 06/12/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available. MITRE ATT&CK project uses the attack technique T1059.007 for this issue.

Upgrading to version 4.3.12 eliminates this vulnerability.

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Productinfo

Type

• WordPress Plugin

Vendor

• wpdevteam

Name

• BetterDocs Plugin

Version

• 4.5.0
• 4.5.1
• 4.5.2
• 4.5.3

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CPE 2.2info

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