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CVE-2023-48228— OAuth2: PKCE can be fully circumvented

Quick assessment

Affected
goauthentik authentik
Exploitation
Public or AI PoC available; prioritize validation
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

authentik是authentik开源的一个开源身份提供应用程序。 authentik存在安全漏洞，该漏洞源于该程序在令牌检查步骤中存在安全漏洞。受影响的产品和版本：authentik 2023.10.3及之前版本，2023.8.4及之前版本。

CVSS 7.5 · High EPSS 1.24% · P68

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2023-48228

Vulnerability Information
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Vulnerability Title
OAuth2: PKCE can be fully circumvented
Source: CVE Program / CVE List V5
Vulnerability Description
authentik is an open-source identity provider. When initialising a oauth2 flow with a `code_challenge` and `code_method` (thus requesting PKCE), the single sign-on provider (authentik) must check if there is a matching and existing `code_verifier` during the token step. Prior to versions 2023.10.4 and 2023.8.5, authentik checks if the contents of `code_verifier` is matching only when it is provided. When it is left out completely, authentik simply accepts the token request with out it; even when the flow was started with a `code_challenge`. authentik 2023.8.5 and 2023.10.4 fix this issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
认证机制不恰当
Source: CVE Program / CVE List V5
Vulnerability Title
authentik 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
authentik是authentik开源的一个开源身份提供应用程序。 authentik存在安全漏洞，该漏洞源于该程序在令牌检查步骤中存在安全漏洞。受影响的产品和版本：authentik 2023.10.3及之前版本，2023.8.4及之前版本。
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
goauthentik authentik < 2023.10.4 -

II. Public POCs for CVE-2023-48228

# POC Description Source Link Shenlong Link
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Qwen3.6-35B-A3B · 9429 chars
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Vulnerability reproduction recording (real sandbox build + trigger, exclusive)
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III. Intelligence Information for CVE-2023-48228

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Patches & Fixes for CVE-2023-48228 (6)

Vendor Advisories for CVE-2023-48228 (1)

Other References for CVE-2023-48228 (3)

IV. Related Vulnerabilities

Same product: authentik
Same vendor: goauthentik
Same weakness: CWE-287

V. Comments for CVE-2023-48228

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