CVE-2026-27804: Parse Server: Account takeover via JWT algorithm confusion in Google auth adapter
(updated )
An unauthenticated attacker can forge a Google authentication token with alg: "none" to log in as any user linked to a Google account, without knowing their credentials. All deployments with Google authentication enabled are affected.
References
- github.com/advisories/GHSA-4q3h-vp4r-prv2
- github.com/parse-community/parse-server
- github.com/parse-community/parse-server/commit/9b94083accb7f3e72c6b8126c195c7a03dd2dfd7
- github.com/parse-community/parse-server/commit/9d5942d50e55c822924c27b05aa98f1393e7a330
- github.com/parse-community/parse-server/releases/tag/8.6.3
- github.com/parse-community/parse-server/releases/tag/9.3.1-alpha.4
- github.com/parse-community/parse-server/security/advisories/GHSA-4q3h-vp4r-prv2
- nvd.nist.gov/vuln/detail/CVE-2026-27804
Code Behaviors & Features
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