要点
- CVE-2026-27804 は parse-server (parseplatform), parse-server に影響する深刻度「緊急」 (CVSS 9.1) の脆弱性です。
- 今後30日間に悪用される確率（EPSS）：0.20%（全脆弱性の 10.0% より高い）。
- 対処：9.3.1, 8.6.3, 9.3.1-alpha.4 以降に更新してください。
| パッケージ | 影響を受けるバージョン | 修正済みバージョン |
|---|
| parse-server | = 9.3.1≥ 9.0.0, < 9.3.1< 8.6.3
| 9.3.18.6.3
|
| parse-server npm | ≥ 9.0.0, < 9.3.1-alpha.4< 8.6.3
| 9.3.1-alpha.48.6.3
|
概要
Impact
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.
Patches
The fix 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.
Workarounds
Disable Google authentication until you can upgrade.
References
NVD の説明
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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