CVE-2026-55954
Missing ID token claim validation in ueberauth_apple allows account takeover
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.
INFO
Published Date :
July 14, 2026, 4:17 p.m.
Last Modified :
July 14, 2026, 4:17 p.m.
Remotely Exploit :
Yes !
Source :
6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Affected Products
The following products are affected by CVE-2026-55954
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 4.0 | CRITICAL | 6b3ad84c-e1a6-4bf7-a703-f496b71e49db | ||||
| CVSS 4.0 | CRITICAL | 6b3ad84c-e1a6-4bf7-a703-f496b71e49db |
Solution
- Update ueberauth_apple to version 0.6.2 or later.
- Implement validation for ID token claims.
- Verify 'iss', 'aud', 'exp', and 'iat' claims.
- Ensure proper handling of token expiration.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-55954.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-55954 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-55954
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-55954 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-55954 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
New CVE Received by 6b3ad84c-e1a6-4bf7-a703-f496b71e49db
Jul. 14, 2026
Action Type Old Value New Value Added Affected [{'cpes': ['cpe:2.3:a:ueberauth:ueberauth_apple:*:*:*:*:*:*:*:*'], 'repo': 'https://github.com/ueberauth/ueberauth_apple', 'vendor': 'ueberauth', 'modules': ["'Elixir.Ueberauth.Strategy.Apple'", "'Elixir.Ueberauth.Strategy.Apple.Token'"], 'product': 'ueberauth_apple', 'versions': [{'status': 'affected', 'version': '0.1.0', 'lessThan': '0.6.2', 'versionType': 'semver'}], 'packageURL': 'pkg:hex/ueberauth_apple', 'packageName': 'ueberauth_apple', 'programFiles': ['lib/ueberauth/strategy/apple.ex', 'lib/ueberauth/strategy/apple/token.ex'], 'collectionURL': 'https://repo.hex.pm', 'defaultStatus': 'unaffected', 'programRoutines': [{'name': "'Elixir.Ueberauth.Strategy.Apple':handle_callback!/1"}, {'name': "'Elixir.Ueberauth.Strategy.Apple.Token':payload/2"}]}, {'cpes': ['cpe:2.3:a:ueberauth:ueberauth_apple:*:*:*:*:*:*:*:*'], 'repo': 'https://github.com/ueberauth/ueberauth_apple', 'vendor': 'ueberauth', 'modules': ["'Elixir.Ueberauth.Strategy.Apple'", "'Elixir.Ueberauth.Strategy.Apple.Token'"], 'product': 'ueberauth_apple', 'versions': [{'status': 'affected', 'version': '3908a187d045c75994b62ce340c3aa26bb8976b8', 'lessThan': '01e2d9c9b3134e1b78633ad82d136d5ff4a61f28', 'versionType': 'git'}], 'packageURL': 'pkg:github/ueberauth/ueberauth_apple', 'packageName': 'ueberauth/ueberauth_apple', 'programFiles': ['lib/ueberauth/strategy/apple.ex', 'lib/ueberauth/strategy/apple/token.ex'], 'collectionURL': 'https://github.com', 'defaultStatus': 'unaffected', 'programRoutines': [{'name': "'Elixir.Ueberauth.Strategy.Apple':handle_callback!/1"}, {'name': "'Elixir.Ueberauth.Strategy.Apple.Token':payload/2"}]}] Added 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. Added CVSS V4.0 AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Added CWE CWE-290 Added Reference https://cna.erlef.org/cves/CVE-2026-55954.html Added Reference https://github.com/ueberauth/ueberauth_apple/commit/01e2d9c9b3134e1b78633ad82d136d5ff4a61f28 Added Reference https://github.com/ueberauth/ueberauth_apple/security/advisories/GHSA-pxx8-68pc-p9mr Added Reference https://osv.dev/vulnerability/EEF-CVE-2026-55954 -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Jul. 14, 2026
Action Type Old Value New Value Added Reference https://github.com/ueberauth/ueberauth_apple/security/advisories/GHSA-pxx8-68pc-p9mr Added SSVC {'id': 'CVE-2026-55954', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'poc'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-07-14T15:56:35.178814Z'}