Which products and versions are affected by CVE-2021-21029?

Affected: Magento versions 2.3.6, 2.4.0, 2.4.0-p1, 2.4.1; magento/community-edition (composer) versions >= 2.4.0; Magento Commerce versions >= unspecified. The full list is in the CVE brief.

Is CVE-2021-21029 being exploited in the wild?

It is not listed in any known-exploited vulnerabilities catalog.

Is CVE-2021-21029 in the CISA KEV catalog?

No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.

Is there a public exploit for CVE-2021-21029?

No public exploit code is known.

Is there a fix for CVE-2021-21029?

Fixed versions are available, including Magento 2.3.6, Magento 2.4.1, magento/community-edition 2.3.6-p1.

How urgently should CVE-2021-21029 be patched?

Brandefense priority: patch immediately, because it is very likely to be exploited soon.

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Vulnerability Intelligence

CVE-2021-21029

Medium

Magento Reflected Cross-site Scripting vulnerability via 'file' parameter

Published Feb 12, 2021 · Updated Sep 8, 2026 · Also known as BIT-magento-2021-21029, GHSA-jwxh-wj79-ccm6

Key Facts

Patch immediately

CVE-2021-21029 is a medium-severity vulnerability (CVSS 4.8 v3.1) affecting Magento, magento/community-edition (composer), Magento Commerce.
It is not listed in any known-exploited vulnerabilities catalog. No public exploit code is known.
EPSS estimates a 85% probability of exploitation in the next 30 days.
Fixed versions are available, including Magento 2.3.6, Magento 2.4.1, magento/community-edition 2.3.6-p1.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

CVSS v3.1

4.8

CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N

EPSS (30-day exploit likelihood)

85%

Higher than 99.7% of all scored CVEs

Exploited in the wild

No known

Not in a known-exploited catalog

Public exploit code

None known

Get the full CVE-2021-21029 brief as a PDF

Every affected product and fixed release, exploitation status and a first 24 hours response checklist, emailed within minutes.

Description

Magento versions 2.4.1 (and earlier), 2.4.0-p1 (and earlier) and 2.3.6 (and earlier) are affected by a Reflected Cross-site Scripting vulnerability via 'file' parameter. Successful exploitation could lead to arbitrary JavaScript execution in the victim's browser. Access to the admin console is required for successful exploitation.

Affected Products

13 affected entries in total

Product	Affected versions	Fixed in
MagentoMagento	2.3.6, 2.4.0, 2.4.0-p1, 2.4.1	2.3.6
magento/community-editioncomposer	>= 2.4.0	2.4.2
Magento Commerce	>= unspecified	n/a

Patched Releases

Magento

2.3.6, 2.4.1

magento/community-edition

2.3.6-p1, 2.4.2

Timeline

Publicly disclosed
Feb 12, 2021
Last updated
Sep 8, 2026

Weakness Type

CWE-79 Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

References

13 more references in the full CVE brief

FAQ

Common Questions.

Magento versions 2.4.1 (and earlier), 2.4.0-p1 (and earlier) and 2.3.6 (and earlier) are affected by a Reflected Cross-site Scripting vulnerability via 'file' parameter.
Affected: Magento versions 2.3.6, 2.4.0, 2.4.0-p1, 2.4.1; magento/community-edition (composer) versions >= 2.4.0; Magento Commerce versions >= unspecified. The full list is in the CVE brief.
It is not listed in any known-exploited vulnerabilities catalog.
No, it is not currently listed in the CISA Known Exploited Vulnerabilities catalog.
No public exploit code is known.
Fixed versions are available, including Magento 2.3.6, Magento 2.4.1, magento/community-edition 2.3.6-p1.
Brandefense priority: patch immediately, because it is very likely to be exploited soon.

Is CVE-2021-21029 Running On Your Attack Surface?

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