How severe is GHSA-fmg6-246m-9g2v?

GHSA-fmg6-246m-9g2v has a CVSS score of 8.2/10, rated HIGH. Immediate patching is strongly recommended.

Which packages are affected by GHSA-fmg6-246m-9g2v?

GHSA-fmg6-246m-9g2v affects the following packages: auth0/login (Packagist). Ecosystems affected: Packagist.

How do I fix GHSA-fmg6-246m-9g2v?

Update auth0/login to 7.21.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-fmg6-246m-9g2v is resolved across your whole dependency graph.

How do I detect GHSA-fmg6-246m-9g2v in my Packagist dependencies?

Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for auth0/login, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

How do I mitigate GHSA-fmg6-246m-9g2v 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 GHSA-fmg6-246m-9g2v actively exploited in the wild?

No public exploit code has been indexed for GHSA-fmg6-246m-9g2v 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.

When was GHSA-fmg6-246m-9g2v published, and has it been updated?

GHSA-fmg6-246m-9g2v was published on April 3, 2026 and was last updated on April 3, 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

HIGH severity

Auth0 laravel-auth0 SDK has Insufficient Entropy in Cookie EncryptionGHSA-fmg6-246m-9g2v

HIGH

GHSA-fmg6-246m-9g2v is a high-severity (CVSS 8.2) vulnerability in auth0/login. A fix is available for auth0/login — see the affected versions and patch details below.

Published

Apr 3, 2026

Updated

Apr 3, 2026

Affected

1 pkg

Patched

1 / 1

Exploits

None indexed

Exploitation data as of Apr 3, 2026 · OSV.dev, FIRST.org (EPSS)

Real-World Exposure

1 pkg affected

🐘auth0/login

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

Impact

In applications built with the Auth0 PHP SDK, cookies are encrypted with insufficient entropy, which may result in threat actors brute-forcing the encryption key and forging session cookies.

Am I Affected?

You are affected if you meet the following preconditions:

Applications using laravel-auth0 SDK, versions between 7.0.0 and 7.20.0
Laravel-auth0 SDK using the Auth0-PHP SDK versions between 8.0.0 to 8.18.0.

Resolution

Upgrade Auth0/laravel-auth0 to version 7.21.0 or greater.

Affected Packages

1 total 1 fixed

Ecosystem	Package	Vulnerable range	Fix
🐘Packagist	`auth0/login`	≥ 7.0.0&&< 7.21.0	7.21.0`composer require auth0/login:^7.21.0`

Detection & mitigation playbook

Open-source dependency

Detect
Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for auth0/login, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.
Fix
Update auth0/login to 7.21.0 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms GHSA-fmg6-246m-9g2v is resolved across your whole dependency graph.
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

### Impact In applications built with the Auth0 PHP SDK, cookies are encrypted with insufficient entropy, which may result in threat actors brute-forcing the encryption key and forging session cookies. ### Am I Affected? You are affected if you meet the following preconditions: - Applications using laravel-auth0 SDK, versions between 7.0.0 and 7.20.0 - Laravel-auth0 SDK using the Auth0-PHP SDK versions between 8.0.0 to 8.18.0. ### Resolution Upgrade Auth0/laravel-auth0 to version 7.21.0 or greater.

O3 Security · Impact-Aware SCA

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