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GHSA-9h33-g3ww-mqff

Pocket ID: OAuth redirect_uri validation bypass via userinfo/host confusion

Source: GitHub Advisory Database (reviewed) High CVE-2026-28512

Packages

EcosystemPackageAffectedFixed in
Go github.com/pocket-id/pocket-id/backend < 0.0.0-20260228130835-3a339e33191c 0.0.0-20260228130835-3a339e33191c

Details

As written in the advisory (Markdown source, shown as plain text).

### 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.

References

External links from the advisory. They lead to third-party sites.