CVE-2023-48228

CRITICALNVD 9.89.8—
EchelonGraph scoreMEDIUM confidence

This critical-severity CVE scores 9.8 under NVD CVSS v3. EPSS exploit probability: 1.2%, top 34% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).

Triggered by: NVD CVSS baseline
Sources: epss, nvd
9.8EG
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS PROB: 1%CVSS: 9.8Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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.

CVSS v3
9.8
EG Score
9.8(medium)
EG Risk
49(Track)
EG Risk 49/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity98% × 45%
Exploitation1% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
1%
EPSS %ILE
68%
KEV
Not listed

Published

November 21, 2023

Last Modified

June 17, 2026

Advisory Details (8)

Auto-updated Sep 21, 2026
Patch available. Sources: github_commit, github_pr, github.
github Patch Available

OAuth2: Insufficient PKCE check · Advisory · goauthentik/authentik · GitHub

https://github.com/goauthentik/authentik/security/advisories/GHSA-fm34-v8xq-f2c3
github_pr

security: fix CVE-2023-48228 (cherry-pick #7666)

Fix merged in goauthentik/authentik PR #7669 on 2023-11-21 — awaiting tagged release

https://github.com/goauthentik/authentik/pull/7669
github_pr

security: fix CVE-2023-48228 (cherry-pick #7666)

Fix merged in goauthentik/authentik PR #7668 on 2023-11-21 — awaiting tagged release

https://github.com/goauthentik/authentik/pull/7668
github_pr

security: fix CVE-2023-48228

Fix merged in goauthentik/authentik PR #7666 on 2023-11-21 — awaiting tagged release

https://github.com/goauthentik/authentik/pull/7666
github_commit

commit b88e39411c12 (goauthentik/authentik)

Fix landed in goauthentik/authentik commit b88e39411c12 — awaiting tagged release

https://github.com/goauthentik/authentik/commit/b88e39411c12e3f9e04125a7887f12354f760a14
github_commit

commit 6b9afed21f7c (goauthentik/authentik)

Fix landed in goauthentik/authentik commit 6b9afed21f7c — awaiting tagged release

https://github.com/goauthentik/authentik/commit/6b9afed21f7c39f171a4a445654cfe415bba37d5
github_commit

commit 3af77ab3821f (goauthentik/authentik)

Fix landed in goauthentik/authentik commit 3af77ab3821f — awaiting tagged release

https://github.com/goauthentik/authentik/commit/3af77ab3821fe9c7df8055ba5eade3d1ecea03a6
generic

authentik/authentik/providers/oauth2/views/token.py at dd4e9030b4e667d3720be2feda24c08972602274 · goauthentik/authentik · GitHub

https://github.com/goauthentik/authentik/blob/dd4e9030b4e667d3720be2feda24c08972602274/authentik/providers/oauth2/views/token.py#L225

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 9× in last 7d / 34× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

Showing the most recent 100 of 178 total refreshes for this CVE.

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Frequently asked(5)

What is CVE-2023-48228?
CVE-2023-48228 is a critical vulnerability published on November 21, 2023. authentik is an open-source identity provider. When initialising a oauth2 flow with a codechallenge and codemethod (thus requesting PKCE), the single sign-on provider (authentik) must check if there is a matching and existing codeverifier during the token step. Prior to versions 2023.10.4 and…
When was CVE-2023-48228 disclosed?
CVE-2023-48228 was first published in the National Vulnerability Database on November 21, 2023, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-48228 actively exploited?
CVE-2023-48228 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 1% probability of exploitation in the next 30 days, which ranks it in the top 32.2% of all scored CVEs.
What is the CVSS score of CVE-2023-48228?
CVE-2023-48228 has a CVSS v3 base score of 9.8 (NVD).
How do I remediate CVE-2023-48228?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-48228, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

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