How severe is CVE-2021-39864?

CVE-2021-39864 has a CVSS score of 6.5/10, rated MEDIUM. Review your exposure and patch according to your risk tolerance.

Which packages are affected by CVE-2021-39864?

CVE-2021-39864 affects the following packages: magento/community-edition (Packagist), magento/community-edition (Packagist), magento/community-edition (Packagist), magento/community-edition (Packagist), magento/project-community-edition (Packagist). Ecosystems affected: Packagist.

How do I fix CVE-2021-39864?

A fix is available for CVE-2021-39864; check the affected-versions list above or the advisory for the patched release of magento/community-edition, then make sure no transitive dependency still pins the vulnerable range.

How do I detect CVE-2021-39864 in my Packagist dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for magento/community-edition, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate CVE-2021-39864 if there is no patch (or I can't update yet)?

If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Is CVE-2021-39864 actively exploited in the wild?

No public exploit code has been indexed for CVE-2021-39864 yet. This does not mean the vulnerability cannot be exploited — absence of public exploits does not imply safety. Apply the recommended fix and use O3 Security to monitor your exposure.

What is the EPSS score for CVE-2021-39864?

CVE-2021-39864 has an EPSS (Exploit Prediction Scoring System) score of 1.6%, placing it in the 76th percentile of all CVEs. EPSS is maintained by FIRST.org and estimates the probability that a vulnerability will be exploited in the wild within the next 30 days. This score indicates relatively lower exploitation probability, though the CVSS severity should still guide your patching priority.

What type of vulnerability is CVE-2021-39864?

CVE-2021-39864 is classified as Cross-Site Request Forgery (CSRF) (CWE-352). This weakness type describe the underlying flaw category, which helps determine the potential impact and the right class of mitigation.

When was CVE-2021-39864 published, and has it been updated?

CVE-2021-39864 was published on October 15, 2021 and was last updated on October 24, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

🐘

🐘 Packagist

Not in CISA KEV

MEDIUM severity

CVE-2021-39864 — community-edition

MEDIUM

CVE-2021-39864 is a medium-severity (CVSS 6.5) Cross-Site Request Forgery (CSRF) vulnerability in magento/community-edition. A fix is available for magento/community-edition — see the affected versions and patch details below.

Magento Open Source allows Cross-Site Request Forgery (CSRF)

Also known asGHSA-94wq-87g6-8h77

Published

Oct 15, 2021

Updated

Oct 24, 2026

Affected

5 pkgs

Patched

1 / 5

Exploits

None indexed

Exploitation data as of Oct 29, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

Exploitation Status

No confirmed exploitation observed yet

CISA’s own triage has not observed active exploitation or public proof-of-concept code for this CVE as of its last assessment.

Exploitation and automatability from CISA’s SSVC triage for CVE-2021-39864.

EPSS Exploitation Probability

via FIRST.org ↗

1.6%probability of exploitation in next 30 days

Lower Risk0.00%

Lower risk than most CVEs76th percentile — riskier than 76% of all scored CVEsHighest risk

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

5 pkgs affected

🐘magento/community-edition🐘magento/community-edition🐘magento/community-edition🐘magento/community-edition🐘magento/project-community-edition

Real-time download stats are indexed for npm and PyPI packages. This vulnerability affects Packagist packages — download data is not available via public APIs for these ecosystems.

Description

Adobe Commerce versions 2.4.2-p2 (and earlier), 2.4.3 (and earlier) and 2.3.7p1 (and earlier) are affected by a cross-site request forgery (CSRF) vulnerability via a Wishlist Share Link. Successful exploitation could lead to unauthorized addition to a customer's cart by an unauthenticated attacker. Access to the admin console is not required for successful exploitation.

Affected Packages

5 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`magento/community-edition`	≥ 2.4.2-p1	No fix
🐘Packagist	`magento/community-edition`	all versions	No fix
🐘Packagist	`magento/community-edition`	all versions	2.3.7-p2`composer require magento/community-edition:^2.3.7-p2`
🐘Packagist	`magento/community-edition`	all versions	No fix
🐘Packagist	`magento/project-community-edition`	all versions	No fix

Affected Products

2 products · 12 configurations

Application

commerceadobe

≤ 2.3.7

3 versions

2.3.72.4.22.4.3

Application

magento open sourceadobe

≤ 2.3.7

3 versions

2.3.72.4.22.4.3

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for magento/community-edition, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
A fix is available for CVE-2021-39864; check the affected-versions list above or the advisory for the patched release of magento/community-edition, then make sure no transitive dependency still pins the vulnerable range.
Workarounds
If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

O3 Security · Impact-Aware SCA

Is CVE-2021-39864 in your dependencies?

Find it across Packagist, including transitive dependencies.

Scan my dependencies How O3 SCA works

CVSS Score

6.5/10CVSS v3 base

Vector breakdown

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

Required

Scope

Unchanged

Confidentiality

None

Integrity

High

Availability

None

Raw vector

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

CWE Classification

CWE-352Cross-Site Request Forgery (CSRF)

Weaponization

No Nuclei template, Metasploit module or public proof-of-concept found.

OpenSSF Scorecard

Package health score

magento2

6.2/10

Maintained10/10

Code-Review1/10

Branch-ProtectionN/A

Assessed Oct 26, 2026

Timeline

Disclosed

Oct 15, 2021

Last updated

Oct 24, 2026

Identifiers

CVE-2021-39864

GHSA-94wq-87g6-8h77

References

Advisoryhelpx.adobe.com · apsb21 86 Advisorynvd.nist.gov · CVE 2021 39864 Packagegithub.com · magento2

Related vulnerabilities

This CVE is medium severity; 8 of 8 other CVEs affecting magento/community-edition are rated as high or higher (top: critical).

CVE-2025-54264CVE-2025-54263CVE-2025-54266CVE-2025-54267CVE-2025-54265CVE-2025-54236CVE-2025-49555CVE-2025-49556

Provenance

Sources

OSV.devNVDFIRST.org (EPSS)

Last verifiedOct 24, 2026

CVE-2021-39864 — community-edition

Exploitation Status

No confirmed exploitation observed yet

EPSS Exploitation Probability

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

Description

Affected Packages

Affected Products

Detection & mitigation playbook

Detect

Fix

Workarounds

Frequently Asked Questions

Is CVE-2021-39864 in your dependencies?