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CVE-2026-27804

CRITICAL

9.1

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.

CVE Details

CVSS v3.1 Score9.1

SeverityCRITICAL

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredNONE

User InteractionNONE

Published2/26/2026

Last Modified3/4/2026

Sourcenvd

Honeypot Sightings0

Affected Products

parseplatform:parse-server

Weaknesses (CWE)

CWE-327CWE-345

References

https://github.com/parse-community/parse-server/commit/9b94083accb7f3e72c6b8126c195c7a03dd2dfd7(security-advisories@github.com)

https://github.com/parse-community/parse-server/commit/9d5942d50e55c822924c27b05aa98f1393e7a330(security-advisories@github.com)

https://github.com/parse-community/parse-server/releases/tag/8.6.3(security-advisories@github.com)

https://github.com/parse-community/parse-server/releases/tag/9.3.1-alpha.4(security-advisories@github.com)

https://github.com/parse-community/parse-server/security/advisories/GHSA-4q3h-vp4r-prv2(security-advisories@github.com)

IOC Correlations

No correlations recorded

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