// For flags

CVE-2021-42360

Starter Templates — Elementor, Gutenberg & Beaver Builder Templates <= 2.7.0 Authenticated Block Import to Stored XSS

Severity Score

5.4
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

1
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

On sites that also had the Elementor plugin for WordPress installed, it was possible for users with the edit_posts capability, which includes Contributor-level users, to import blocks onto any page using the astra-page-elementor-batch-process AJAX action. An attacker could craft and host a block containing malicious JavaScript on a server they controlled, and then use it to overwrite any post or page by sending an AJAX request with the action set to astra-page-elementor-batch-process and the url parameter pointed to their remotely-hosted malicious block, as well as an id parameter containing the post or page to overwrite. Any post or page that had been built with Elementor, including published pages, could be overwritten by the imported block, and the malicious JavaScript in the imported block would then be executed in the browser of any visitors to that page.

En los sitios que también tenían instalado el plugin de Elementor para WordPress, era posible que usuarios con la capacidad edit_posts, que incluye a usuarios de nivel Contributor, importaran bloques en cualquier página usando la acción AJAX astra-page-elementor-batch-process. Un atacante podía diseñar y alojar un bloque que contuviera JavaScript malicioso en un servidor que controlara, y luego usarlo para sobrescribir cualquier publicación o página enviando una petición AJAX con la acción establecida como astra-page-elementor-batch-process y el parámetro url apuntando a su bloque malicioso alojado remotamente, así como un parámetro id que contuviera la publicación o página a sobrescribir. Cualquier entrada o página construida con Elementor, incluidas las páginas publicadas, podía ser sobrescrita por el bloque importado, y el JavaScript malicioso del bloque importado era ejecutado entonces en el navegador de cualquier visitante de esa página

*Credits: Ramuel Gall, Wordfence
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
High
Availability
Low
Attack Vector
Network
Attack Complexity
Medium
Authentication
Single
Confidentiality
None
Integrity
Partial
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-10-04 CVE Published
  • 2021-10-14 CVE Reserved
  • 2023-06-10 EPSS Updated
  • 2024-08-04 CVE Updated
  • 2024-08-04 First Exploit
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
  • CWE-99: Improper Control of Resource Identifiers ('Resource Injection')
  • CWE-284: Improper Access Control
  • CWE-862: Missing Authorization
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Brainstormforce
Search vendor "Brainstormforce"
 Starter Templates
Search vendor "Brainstormforce" for product "Starter Templates"
 <= 2.7.0
Search vendor "Brainstormforce" for product "Starter Templates" and version " <= 2.7.0"
wordpress
Affected