What’s Vulnerable › Vulnerabilities

CVE-2026-28512: Pocket ID: OAuth redirect_uri validation bypass via userinfo/host confusion

• Severity: medium (CVSS 6.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-03-10 · updated 2026-06-17
• Weakness: CWE-601

Description

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.

Affected products

• pocket-id: from 2.0.0 before 2.4.0 — fixed in 2.4.0

How to fix

Upgrade to a fixed version: pocket-id 2.4.0. Check the vendor advisory for mitigations.

References

• https://github.com/pocket-id/pocket-id/commit/3a339e33191c31b68bf57db907f800d9de5ffbc8
• https://github.com/pocket-id/pocket-id/security/advisories/GHSA-9h33-g3ww-mqff

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