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.
Metrics
Affected Vendors & Products
References
History
Wed, 04 Mar 2026 03:15:00 +0000
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| First Time appeared |
Parseplatform
Parseplatform parse-server |
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| CPEs | cpe:2.3:a:parseplatform:parse-server:*:*:*:*:*:node.js:*:* cpe:2.3:a:parseplatform:parse-server:9.3.1:alpha1:*:*:*:node.js:*:* cpe:2.3:a:parseplatform:parse-server:9.3.1:alpha2:*:*:*:node.js:*:* cpe:2.3:a:parseplatform:parse-server:9.3.1:alpha3:*:*:*:node.js:*:* |
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| Vendors & Products |
Parseplatform
Parseplatform parse-server |
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| Metrics |
cvssV3_1
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Sat, 28 Feb 2026 05:15:00 +0000
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ssvc
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Thu, 26 Feb 2026 13:30:00 +0000
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Parse Community
Parse Community parse Server |
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| Vendors & Products |
Parse Community
Parse Community parse Server |
Thu, 26 Feb 2026 00:00:00 +0000
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| 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. | |
| Title | Parse Server: Account takeover via JWT algorithm confusion in Google auth adapter | |
| Weaknesses | CWE-327 CWE-345 |
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| References |
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| Metrics |
cvssV4_0
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Status: PUBLISHED
Assigner: GitHub_M
Published: 2026-02-25T23:48:20.858Z
Updated: 2026-02-26T17:03:50.903Z
Reserved: 2026-02-24T02:31:33.266Z
Link: CVE-2026-27804
Updated: 2026-02-26T17:03:36.283Z
Status : Analyzed
Published: 2026-02-26T00:16:25.793
Modified: 2026-03-04T03:09:41.600
Link: CVE-2026-27804
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