Parse Server: Account takeover via JWT algorithm confusion in Google auth adapter
Description
Parse Server is an open source backend that can be deployed to any infrastructure that can run Node.js. Prior to versions 8.6.3 and 9.1.1-alpha.4, 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. The fix in versions 8.6.3 and 9.1.1-alpha.4 hardcodes the expected RS256 algorithm instead of trusting the JWT header, and replaces the Google adapter's custom key fetcher with jwks-rsa which rejects unknown key IDs. As a workaround, dsable Google authentication until upgrading is possible.
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LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
parse-servernpm | >= 9.0.0, < 9.3.1-alpha.4 | 9.3.1-alpha.4 |
parse-servernpm | < 8.6.3 | 8.6.3 |
Affected products
3- osv-coords2 versions
< 8.6.3+ 1 more
- (no CPE)range: < 8.6.3
- (no CPE)range: >= 9.0.0, < 9.3.1-alpha.4
- Range: >= 9.0.0, < 9.3.1-alpha.4
Patches
Vulnerability mechanics
References
7- github.com/advisories/GHSA-4q3h-vp4r-prv2ghsaADVISORY
- nvd.nist.gov/vuln/detail/CVE-2026-27804ghsaADVISORY
- github.com/parse-community/parse-server/commit/9b94083accb7f3e72c6b8126c195c7a03dd2dfd7ghsax_refsource_MISCWEB
- github.com/parse-community/parse-server/commit/9d5942d50e55c822924c27b05aa98f1393e7a330ghsax_refsource_MISCWEB
- github.com/parse-community/parse-server/releases/tag/8.6.3ghsax_refsource_MISCWEB
- github.com/parse-community/parse-server/releases/tag/9.3.1-alpha.4ghsax_refsource_MISCWEB
- github.com/parse-community/parse-server/security/advisories/GHSA-4q3h-vp4r-prv2ghsax_refsource_CONFIRMWEB
News mentions
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