CVE-2023-48228
CWE-287Published: November 21, 2023· Updated: Jun 17, 2026
Official 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.
Risk Analysis
The authentik identity provider fails to properly validate the code_verifier during OAuth2 flows when PKCE is used, allowing token requests to proceed without it. This critical flaw could potentially lead to authentication bypass.
No public exploit is known, and it is not in CISA KEV. The vulnerability is remotely exploitable with low attack complexity.
Upgrade authentik to version 2023.8.5 or 2023.10.4.
Technical Analysis
CVE-2023-48228 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.
The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.
A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.
From a weakness classification perspective (CWE-287): Authentication bypass vulnerabilities allow attackers to access protected resources without valid credentials.
CVSS v3.1 Vector Breakdown
Affected Vendors & Products
Exploit & PoC Resources
Official Patches & Advisories
All References (20)
Quick Facts
Related CVEs (CWE-287)
Recommended Actions
- →Apply vendor patches immediately
- →Monitor CVE-2023-48228 in threat intel feeds
- →Review IDS/IPS signatures for exploitation attempts