Auth bypass in Goauthentik Authentik
CVE-2023-48228
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.
Vulnerability class: Broken Authentication
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N.
EPSS exploit prediction
EPSS: 0.012 (67.9th percentile), scored .
Low probability of exploitation in the next 30 days, but still tracked. 68th percentile — 67.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000
Affected products
- Goauthentik Authentik — versions < 2023.10.4, < 2023.8.5
Weakness classification (CWE)
References
- github.com/goauthentik/authentik/security/advisories/GHSA-fm34-v8xq-f2c3 (Exploit, Vendor Advisory)
- github.com/goauthentik/authentik/pull/7666 (Patch)
- github.com/goauthentik/authentik/pull/7668 (Patch)
- github.com/goauthentik/authentik/pull/7669 (Patch)
- github.com/goauthentik/authentik/commit/3af77ab3821fe9c7df8055ba5eade3d1ecea03a6 (Patch)
- github.com/goauthentik/authentik/commit/6b9afed21f7c39f171a4a445654cfe415bba37d5 (Patch)
- github.com/goauthentik/authentik/commit/b88e39411c12e3f9e04125a7887f12354f760a14 (Patch)
- github.com/goauthentik/authentik/blob/dd4e9030b4e667d3720be2feda24c08972602274/… (Product)
- github.com/goauthentik/authentik/releases/tag/version/2023.10.4 (Release Notes)
- github.com/goauthentik/authentik/releases/tag/version/2023.8.5 (Release Notes)
Frequently asked questions
- What is CVE-2023-48228?
- CVE-2023-48228 is a high-severity vulnerability in Goauthentik Authentik, classified under Improper Authentication. CVSS score: 7.5/10. Published 2023-11-21.
- How severe is CVE-2023-48228?
- High severity. CVSS v3 base score is 7.5 out of 10.