What is GHSA-GHC5-95C2-VWCV?

It's a high-severity GitHub advisory on insufficient entropy in Auth0 Symfony SDK cookie encryption, CVSS 8.2, allowing session forgery and account takeover.

How do I fix Auth0 Symfony SDK vulnerability?

Upgrade to auth0/symfony 5.8.0+, auth0/auth0-php 8.19.0+, rotate encryption keys, invalidate sessions via restart.

Does Auth0 Symfony SDK vuln affect all PHP apps?

No, mainly Symfony apps using vulnerable versions for Auth0 session management.

📦 Open Source

Auth0 Symfony SDK's Weak Cookies Enable Account Takeovers

Auth0's Symfony SDK has a nasty entropy bug turning cookies into brute-force playgrounds. Attackers forge sessions, snag accounts—your Symfony app might be wide open.

DevTools Feed Apr 03, 2026 3 min read 36 views

Broken padlock on a digital cookie representing Auth0 Symfony SDK entropy flaw

⚡ Key Takeaways

Upgrade auth0/symfony to 5.8.0+ and auth0/auth0-php to 8.19.0+ immediately. 𝕏
Rotate cookie encryption keys and invalidate all active sessions. 𝕏
This flaw highlights risks in managed auth providers—audit third-party SDKs rigorously. 𝕏

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#Auth0 #Symfony SDK #cookie encryption #security vulnerability

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Originally reported by dev.to

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