---
title: "CVE-2026-54072: Authorizer: Unvalidated redirect_uri in /authorize leaks OAuth2 tokens to attacker-controlled URL"
url: https://erroneo.us/security/cve/CVE-2026-54072/
description: "CVE-2026-54072 (github.com/authorizerdev/authorizer (Go)): Authorizer is an open-source, self-hostable authentication and authorization server. Prior to…"
type: vulnerability-record
section: "Security Digest"
date_published: 2026-09-11
date_modified: 2026-09-15
publisher: erroneo.us
author: erroneo.us Security Desk
cve: "CVE-2026-54072"
kev: false
cvss: 9.3
epss: 0.00463
license: All rights reserved. Quote with attribution and a link.
---

# CVE-2026-54072: Authorizer: Unvalidated redirect_uri in /authorize leaks OAuth2 tokens to attacker-controlled URL

**Signal:** Critical and remotely reachable. No known exploitation yet, but it is network-reachable without credentials. (Computed from CISA KEV, EPSS and CVSS; not an editorial verdict.)

## Should you act?

- Not in CISA KEV , but CISA’s SSVC assessment records a public proof-of-concept, so attack code exists.
- EPSS 0.5% , percentile 39: FIRST’s model estimates a 0.5% chance of exploitation activity in the next 30 days, higher than 39% of all scored CVEs (low). EPSS is a probability, not a verdict.
- Needs a user to click or open something. Phishing makes that realistic, but it is not wormable.
- Only applies if your dependency tree includes github.com/authorizerdev/authorizer (Go) < 0.0.0-20260409051328-bd3f5baf6d3d, fixed in 0.0.0-20260409051328-bd3f5baf6d3d . Check your lockfile, including transitive dependencies.

## What it is

Authorizer is an open-source, self-hostable authentication and authorization server. Prior to version 2.2.1, the /authorize endpoint accepts any redirecturi without validating it against AllowedOrigins. When responsetype=token or responsetype=idtoken, the server appends accesstoken, idtoken, and refreshtoken as query parameters and issues a 302 redirect to the attacker-supplied URL. An unauthenticated attacker can obtain the required clientid from the public /graphql?query={meta{clientid}} endpoint. A partial fix was applied in v2.0.1 to other handlers (oauthlogin, verifyemail, magiclinklogin, forgotpassword, invitemembers, oauthcallback) but /authorize was not included. Version 2.2.1 contains a more complete fix.

## Affected packages

- Go `github.com/authorizerdev/authorizer` < 0.0.0-20260409051328-bd3f5baf6d3d → fixed: 0.0.0-20260409051328-bd3f5baf6d3d

## Affected products (CVE record)

- authorizerdev authorizer: < 2.2.1

## Severity

- GitHub_M CVSS 3.1: 9.3 `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N`
- GitHub CVSS 3.1: 9.3 `CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N`

## Exploitation

- CISA KEV: not listed (no confirmed in-the-wild exploitation known to CISA).
- CISA SSVC assessment: exploitation poc , automatable no , technical impact total .
- FIRST EPSS (model of 2026-10-21): 0.46% probability of exploitation activity in the next 30 days; percentile 39.

## Sources

- [GitHub Advisory GHSA-h29v-hj44-q8cv](https://github.com/advisories/GHSA-h29v-hj44-q8cv)
- [CVE.org record CVE-2026-54072](https://www.cve.org/CVERecord?id=CVE-2026-54072)
- [NVD entry CVE-2026-54072](https://nvd.nist.gov/vuln/detail/CVE-2026-54072)
- [github.com](https://github.com/authorizerdev/authorizer/security/advisories/GHSA-h29v-hj44-q8cv)

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Source page: https://erroneo.us/security/cve/CVE-2026-54072/ · Security Digest: https://erroneo.us/security/ · More: https://erroneo.us/llms.txt