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Vulnerabilities CVE-2026-13458

CVE-2026-13458

Medium
Open
TLP:CLEAR

GenerateBlocks <= 2.3.0 - Authenticated (Contributor+) Stored Cross-Site Scripting via Dynamic Tag Injection in HTML Attributes

AI Analysis

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Description

The GenerateBlocks plugin for WordPress is vulnerable to Stored Cross-Site Scripting via Dynamic Tag Injection in HTML Attributes in all versions up to, and including, 2.3.0 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. A Contributor-level attacker can store the malicious payload by placing a dynamic tag such as {{post_meta key:...}} in a non-URL HTML attribute (e.g., title, aria-label, alt, or data-* attributes) of a GenerateBlocks element block, then setting the corresponding unprotected post meta key via the Custom Fields metabox to a value containing a closing quote and an injected event-handler attribute.

Details

CVSS Score
6.4
EPSS Score
0.31%

23.1th percentile

CVSS Vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N
Confidence
90%
Published
Aug 1, 2026
Last Modified
Aug 3, 2026
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