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I. Basic Information for CVE-2026-27804
Vulnerability Information

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Vulnerability Title
Parse Server: Account takeover via JWT algorithm confusion in Google auth adapter
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
使用已被攻破或存在风险的密码学算法
Source: NVD (National Vulnerability Database)
Vulnerability Title
Parse Server 数据伪造问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Parse Server是Parse Platform开源的一个开源后端,可以部署到任何可以运行 Node.js 的基础设施。 Parse Server 8.6.3之前版本和9.1.1-alpha.4之前版本存在数据伪造问题漏洞,该漏洞源于未经验证的攻击者可伪造alg为none的Google身份验证令牌,可能导致任意用户登录。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
VendorProductAffected VersionsCPESubscribe
parse-communityparse-server >= 9.0.0, < 9.3.1-alpha.4 -
II. Public POCs for CVE-2026-27804
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III. Intelligence Information for CVE-2026-27804
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