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CVE-2026-55954— Missing ID token claim validation in ueberauth_apple allows account takeover

Quick assessment

Affected
ueberauth ueberauth_apple
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

ueberauth Ueberauth Apple是ueberauth组织开源的一款Apple账户认证策略模块。 Ueberauth Apple 0.1.0版本至0.6.2之前版本存在授权问题漏洞，该漏洞源于Ueberauth.Strategy.Apple.Token.payload/2函数未验证注册声明（包括iss、aud、exp、iat和sub声明），可能导致攻击者伪造身份验证，通过获取Apple签名的ID令牌实现账户接管。

AI Predicted 9.8 Difficulty: Moderate EPSS 0.41% · P34

Affected Version Matrix 2

VendorProduct Version RangeStatus
ueberauth ueberauth_apple 0.1.0< 0.6.2 affected
3908a187d045c75994b62ce340c3aa26bb8976b8< 01e2d9c9b3134e1b78633ad82d136d5ff4a61f28 affected
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I. Basic Information for CVE-2026-55954

Vulnerability Information
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Vulnerability Title
Missing ID token claim validation in ueberauth_apple allows account takeover
Source: CVE Program / CVE List V5
Vulnerability Description
Authentication Bypass by Spoofing vulnerability in ueberauth ueberauth_apple allows account takeover via unvalidated ID token claims. The Ueberauth.Strategy.Apple.Token.payload/2 function verifies the JWT signature of the callback id_token against Apple's JWKS but does not validate any registered claims. The iss, aud, exp, and iat claims are read from the token and passed on to Ueberauth.Strategy.Apple.handle_callback!/1, which derives the logged-in user's uid and email directly from the unvalidated sub claim. An attacker who obtains any Apple-signed ID token bearing the victim's sub (via a captured expired token, or via an ID token issued to a sibling client in the same Apple developer team) can replay it against the vulnerable callback and be authenticated as the victim. The absent exp check makes stolen tokens usable indefinitely, and the absent aud check enables cross-application account takeover across clients that share an Apple developer team. This issue affects ueberauth_apple: from 0.1.0 before 0.6.2.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
使用欺骗进行的认证绕过
Source: CVE Program / CVE List V5
Vulnerability Title
Ueberauth Apple 授权问题漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
ueberauth Ueberauth Apple是ueberauth组织开源的一款Apple账户认证策略模块。 Ueberauth Apple 0.1.0版本至0.6.2之前版本存在授权问题漏洞，该漏洞源于Ueberauth.Strategy.Apple.Token.payload/2函数未验证注册声明（包括iss、aud、exp、iat和sub声明），可能导致攻击者伪造身份验证，通过获取Apple签名的ID令牌实现账户接管。
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

Vendor Product Affected Versions CPE Subscribe
ueberauth ueberauth_apple 0.1.0 ~ 0.6.2 cpe:2.3:a:ueberauth:ueberauth_apple:*:*:*:*:*:*:*:*
ueberauth ueberauth_apple 3908a187d045c75994b62ce340c3aa26bb8976b8 ~ 01e2d9c9b3134e1b78633ad82d136d5ff4a61f28 cpe:2.3:a:ueberauth:ueberauth_apple:*:*:*:*:*:*:*:*

II. Public POCs for CVE-2026-55954

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III. Intelligence Information for CVE-2026-55954

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Vendor Advisories for CVE-2026-55954 (3)

IV. Related Vulnerabilities

Same vendor: ueberauth
Same weakness: CWE-290

V. Comments for CVE-2026-55954

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