CVE-2023-48228 (GCVE-0-2023-48228)

Vulnerability from cvelistv5 – Published: 2023-11-21 20:48 – Updated: 2024-08-02 21:23
VLAI
Title
OAuth2: PKCE can be fully circumvented
Summary
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
CWE
  • CWE-287 - Improper Authentication
Assigner
GitHub_M CNA under the mitre root
CNA scorecard C 72/100 over 7876 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
goauthentik authentik Affected: < 2023.10.4
Affected: < 2023.8.5
guessed Create a notification for this product.
Show details on NVD website
To clipboard 

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        "id": "CVE-2023-48228",
        "lastModified": "2026-06-17T06:33:47.157",
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    "redhat_vex": {
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      "cve": "CVE-2023-48228",
      "id": "CVE-2023-48228",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_not_affected": "1",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "OAuth2: PKCE can be fully circumvented",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-48228.json",
      "version": "3"
    }
  }
}



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How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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