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Vulnerability details

CVE-2026-54072

authorizerdev authorizer

Authorizer: Unvalidated redirect_uri in /authorize leaks OAuth2 tokens to attacker-controlled URL

CVSS 3.1
9.3Critical

Official description

Authorizer is an open-source, self-hostable authentication and authorization server. Prior to version 2.2.1, the `/authorize` endpoint accepts any `redirect_uri` without validating it against `AllowedOrigins`. When `response_type=token` or `response_type=id_token`, the server appends `access_token`, `id_token`, and `refresh_token` as query parameters and issues a 302 redirect to the attacker-supplied URL. An unauthenticated attacker can obtain the required `client_id` from the public `/graphql?query={meta{client_id}}` endpoint. A partial fix was applied in v2.0.1 to other handlers (`oauth_login`, `verify_email`, `magic_link_login`, `forgot_password`, `invite_members`, `oauth_callback`) but `/authorize` was not included. Version 2.2.1 contains a more complete fix.

CVSS scores

ScoreVersionSourceVector
9.3Critical 3.1 CVEProject cvelistV5 (CNA) (GitHub_M) CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N

Affected products

VendorProductVersionsSource
authorizerdev authorizer < 2.2.1 CVEProject cvelistV5 (CNA)

References and advisories

1
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Details

Published
2026-09-11
Last updated
2026-09-15
State
Published
Assigner (CNA)
GitHub_M

Exploit prediction (EPSS)

0.46%
Probability of exploitation in 30 days
40.3%
Percentile (among all CVEs)

SSVC assessment (CISA)

Automatable
No
Exploitation
Proof of concept
Technical impact
Total

Weaknesses (CWE)

  • CWE-601
    URL Redirection to Untrusted Site ('Open Redirect')