CVE-2021-42360Network attack vector

Stored XSS via unauthorized block import

Published Nov 17, 2021 · Updated Feb 14, 2025

Stored XSS in Starter Templates 2.7.0 and earlier allows remote authenticated users to overwrite Elementor pages via an AJAX block import. The astra-page-elementor-batch-process action accepts a remotely hosted block URL and post ID for users with edit_posts, allowing crafted JavaScript to persist in imported content. Sites must also have Elementor installed, and visitors viewing overwritten pages execute the injected script, enabling page tampering or session hijacking.

CVSS severity7.6
High
EPSS probability0.60%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Starter Templates 2.7.0 and earlier allows remote authenticated users to overwrite Elementor pages via an AJAX block import. The astra-page-elementor-batch-process action accepts a remotely hosted block URL and post ID for users with edit_posts, allowing crafted JavaScript to persist in imported content. Sites must also have Elementor installed, and visitors viewing overwritten pages execute the injected script, enabling page tampering or session hijacking.

The record

CVE
CVE-2021-42360
Published
Nov 17, 2021
Updated
Feb 14, 2025
Vendor
Brainstorm Force
Product
Starter Templates
Classifications
CWE-284, CWE-79, CWE-99, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 17, 2021CVE publishedPublication date reported by the CVE source.
  2. Feb 14, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.7.0 <=2.7.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Brainstorm Force · Starter Templatesversion=2.7.0 <=2.7.0

Published CVSS scores

7.6NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:H/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-284Improper Access Control
CWE-79Cross-site Scripting (XSS)
CWE-99Improper Control of Resource Identifiers (Resource Injection)
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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