CVE-2021-21029 | Magento Commerce Reflected Cross-site Scripting Vulnerability Could Lead To Arbitrary JavaScript Execution

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.

Published: 2021-02-11 Last update: 2024-11-21 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2021-21029 is rated Moderate Risk (48.3/100): CVSS Medium severity, with high exploitation likelihood (EPSS 43.50%, 98th percentile). EPSS ranks this CVE among the most likely to be exploited in the near term. High exploitation likelihood—assess exposure and prioritize remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2021-21029

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-05-01 50.05% 43.50% -6.55%
2 2026-04-10 43.50% 50.05% +6.55%
3 2025-11-21 — 43.50% —

Full EPSS history (12 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2021-21029

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.8 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 1.7 2.7 [email protected]
4.8 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:H/UI:R/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:H)
They need powerful rights—admin, root, or similar—before this pays off.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 1.7 2.7 [email protected]
3.5 2.0 LOW
AV:N/AC:M/Au:S/C:N/I:P/A:N Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:N)
No confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:N)
No availability impact.
 6.8 2.9 [email protected]

Weakness enumeration for CVE-2021-21029

GitHub Security Advisory for CVE-2021-21029

GHSA-jwxh-wj79-ccm6 · Severity: medium · Ecosystem: composer — Magento Reflected Cross-site Scripting vulnerability via 'file' parameter

Affected software / configurations for CVE-2021-21029

Vendor Product Version Raw CPE
magento magento < 2.3.6 cpe:2.3:a:magento:magento:*:*:*:*:commerce:*:*:*
magento magento < 2.3.6 cpe:2.3:a:magento:magento:*:*:*:*:open_source:*:*:*
magento magento 2.3.6 cpe:2.3:a:magento:magento:2.3.6:-:*:*:commerce:*:*:*
magento magento 2.3.6 cpe:2.3:a:magento:magento:2.3.6:-:*:*:open_source:*:*:*
magento magento 2.4.0 cpe:2.3:a:magento:magento:2.4.0:-:*:*:commerce:*:*:*
magento magento 2.4.0 cpe:2.3:a:magento:magento:2.4.0:-:*:*:open_source:*:*:*
magento magento 2.4.0 cpe:2.3:a:magento:magento:2.4.0:p1:*:*:commerce:*:*:*
magento magento 2.4.0 cpe:2.3:a:magento:magento:2.4.0:p1:*:*:open_source:*:*:*
magento magento 2.4.1 cpe:2.3:a:magento:magento:2.4.1:-:*:*:commerce:*:*:*
magento magento 2.4.1 cpe:2.3:a:magento:magento:2.4.1:-:*:*:open_source:*:*:*

References for CVE-2021-21029

cvelogic Threat Intelligence