high7.1
CVE-2026-28512
Pocket ID: OAuth redirect_uri validation bypass via userinfo/host confusion
Impact
### 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.
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/pocket-id/pocket-id/backend | < 0.0.0-20260228130835-3a339e33191c | 0.0.0-20260228130835-3a339e33191c |
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Pocket-Id | Pocket Id | from 2.0.0 before 2.4.0 |