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?

No patched version of magento/community-edition has shipped for CVE-2021-39864 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.

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. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.

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.

How does O3 Security protect against CVE-2021-39864?

O3 pinpoints whether CVE-2021-39864 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

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 72th 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 April 10, 2026. Advisory data evolves as severity scores, affected ranges, and exploit intelligence are revised — always check the latest version of the advisory before acting.

CVE-2021-39864: magento/community-edition Cross-Site Request Fo…

EPSS Exploitation Probability

via FIRST.org ↗

1.6%probability of exploitation in next 30 days

Lower Risk72th percentile+0.57%

EPSS (Exploit Prediction Scoring System) is a daily probability model maintained by FIRST.org. It estimates the likelihood a CVE will be exploited in production environments within the next 30 days, derived from real-world threat intelligence signals.

Blast Radius

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 customer 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
🐘Packagist	`magento/community-edition`	all versions	No fix
🐘Packagist	`magento/project-community-edition`	all versions	No fix

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. O3's reachability analysis confirms whether the vulnerable code path is actually invoked in your application, so you act on real exposure instead of every transitive match.
Fix
No patched version of magento/community-edition has shipped for CVE-2021-39864 yet. Where your build allows, override or pin the dependency away from the vulnerable range, and apply any maintainer-recommended mitigation.
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.
How O3 protects you
O3 pinpoints whether CVE-2021-39864 is reachable in your code and exactly where to fix it, then blocks exploitation in production at runtime until the patched version is deployed.

Tailored to CVE-2021-39864. Runtime protection reduces exposure until a permanent patch is applied and verified — it complements patching, it doesn't replace it.

Frequently Asked Questions

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 customer cart by an unauthenticated attacker. Access to the admin console is not required for successful exploitation.

O3 Security · Impact-Aware SCA

Is CVE-2021-39864 in your dependencies?

O3 detects CVE-2021-39864 across Packagist dependencies and uses function-level reachability to confirm whether the vulnerable code path is actually reachable — not just present. No false positives.

Scan my dependencies How O3 SCA works

CVE-2021-39864