---
id: CVE-2025-68158
title: Authlib is a Python library which builds OAuth and OpenID Connect servers
summary: >-
  Authlib is a Python library which builds OAuth and OpenID Connect servers. In
  versions 1.0.0 through 1.6.5, cache-backed state/request-token storage is not
  tied to the initiating user session, so CSRF is possible for any attacker that
  ha…
severity: medium
cvss: 5.7
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N'
cwe:
  - CWE-352
vendor: authlib
product: authlib
affected:
  - authlib < 1.6.6
patched:
  - authlib 1.6.6
published: '2026-01-08'
updated: '2026-10-14'
sourceUpdated: '2026-10-14T17:10:00.210'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2025-68158'
references:
  - url: >-
      https://github.com/authlib/authlib/commit/2808378611dd6fb2532b189a9087877d8f0c0489
    label: security-advisories@github.com
  - url: >-
      https://github.com/authlib/authlib/commit/7974f45e4d7492ab5f527577677f2770ce423228
    label: security-advisories@github.com
  - url: 'https://github.com/authlib/authlib/security/advisories/GHSA-fg6f-75jq-6523'
    label: security-advisories@github.com
  - url: 'https://github.com/authlib/authlib/security/advisories/GHSA-fg6f-75jq-6523'
    label: 134c704f-9b21-4f2e-91b3-4a467353bcc0
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2025-68158'
  - url: 'https://github.com/authlib/authlib'
tags:
  - nvd
  - osv
  - pip
epss: 0.00272
epssPercentile: 0.19475
aliases:
  - GHSA-fg6f-75jq-6523
  - PYSEC-2026-1201
ecosystem: pip
ingestedAt: '2026-07-08T18:25:48.891Z'
---

## Overview

Authlib is a Python library which builds OAuth and OpenID Connect servers. In versions 1.0.0 through 1.6.5, cache-backed state/request-token storage is not tied to the initiating user session, so CSRF is possible for any attacker that has a valid state (easily obtainable via an attacker-initiated authentication flow). When a cache is supplied to the OAuth client registry, FrameworkIntegration.set_state_data writes the entire state blob under _state_{app}_{state}, and get_state_data ignores the caller’s session altogether. This issue has been patched in version 1.6.6.

## Affected

- `authlib < 1.6.6`

## Remediation

Upgrade past the affected range:

- `authlib 1.6.6`

## Package advisory (CVE-2025-68158)

Affected packages:

- `authlib >= 1.0.0, < 1.6.6`

Patched in:

- `authlib 1.6.6`

Source: https://osv.dev/vulnerability/GHSA-fg6f-75jq-6523