---
id: CVE-2026-13458
title: >-
  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
summary: >-
  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. Thi…
severity: medium
cvss: 6.4
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:N'
cwe:
  - CWE-79
published: '2026-08-01'
updated: '2026-08-01'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-13458'
references:
  - url: >-
      https://plugins.trac.wordpress.org/browser/generateblocks/tags/2.2.1/includes/dynamic-tags/class-dynamic-tag-callbacks.php#L388
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/generateblocks/tags/2.2.1/includes/dynamic-tags/class-register-dynamic-tag.php#L196
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/generateblocks/tags/2.2.1/includes/functions.php#L2145
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/generateblocks/tags/2.2.1/includes/general.php#L689
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/generateblocks/tags/2.3.0/includes/dynamic-tags/class-dynamic-tag-callbacks.php#L388
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/generateblocks/tags/2.3.0/includes/dynamic-tags/class-register-dynamic-tag.php#L196
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/generateblocks/tags/2.3.0/includes/functions.php#L2145
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/browser/generateblocks/tags/2.3.0/includes/general.php#L689
    label: security@wordfence.com
  - url: >-
      https://plugins.trac.wordpress.org/changeset?reponame=&old=3625942%40generateblocks&new=3625942%40generateblocks
    label: security@wordfence.com
  - url: >-
      https://www.wordfence.com/threat-intel/vulnerabilities/id/402e10b4-84f0-4f93-a85c-037876d26e58?source=cve
    label: security@wordfence.com
tags:
  - nvd
epss: 0.00419
epssPercentile: 0.33454
ingestedAt: '2026-08-02T05:17:47.905Z'
---

## Overview

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.

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.