GitHub Advisoryadvisory · Go

GHSA-9h33-g3ww-mqff Pocket ID: OAuth redirect_uri validation bypass via userinfo/host confusion

HIGH Published 2026-03-09 Modified 2026-03-10 Official page ↗
Aliases
CVE-2026-28512
Ecosystem
Go
Packages
github.com/pocket-id/pocket-id/backend
Severity
High
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Weaknesses
CWE-601
Reviewed
2026-03-09

Affected packages

• Go github.com/pocket-id/pocket-id/backend: < 0.0.0-20260228130835-3a339e33191c → fixed in 0.0.0-20260228130835-3a339e33191c

Description

Impact A flaw in callback URL validation allowed crafted `redirect_uri` values containing URL userinfo (`@`) to bypass legitimate callback pattern checks. If an attacker can trick a user into opening a malicious authorization link, the authorization code may be redirected to an attacker-controlled host. Patches Fixed in `v2.3.1` (commit 3a339e33191c31b68bf57db907f800d9de5ffbc8). The fix replaces delimiter-based callback matching with structured URL pattern matching and updates validation logic/tests. Workarounds • Reject callback URLs containing userinfo (`@`) at reverse proxy / app policy level if feasible.

Related

Alias · CVE (1)

  • CVE-2026-28512 Pocket ID is an OIDC provider that allows users to authenticate with their passkeys to your services. vulnerability

Weakness · CWE (1)

  • CWE-601 URL Redirection to Untrusted Site weakness

References