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EUVD-2026-275198

2026-10-09T08:26:34.575041+00:00

EUVD-2026-275198

fkie_cve-2026-28512

2026-10-09T08:26:34.575072+00:00

Pocket ID is an OIDC provider that allows users to authenticate with their passkeys to your services. From 2.0.0 to before 2.4.0, 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. This vulnerability is fixed in 2.4.0.

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

2026-10-09T08:26:34.575103+00:00

Affected: Go: github.com/pocket-id/pocket-id/backend

### 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.