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

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HIGH

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

Published Mar 9, 2026

7.1

HIGH

CVSS 3.1

EPSS 0.27%

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

Vendor Pocket-ID Product Pocket-ID Default
n/a
- Version
  >= 2.0.0, < 2.4.0
  Status
  affected
  Constraints
  -

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor

Product

Default status

Versions

Pocket-ID

n/a

Version	Status	Constraints
>= 2.0.0, < 2.4.0	affected	-

github.com/pocket-id/pocket-id/backend

Go

Introduced 0 Fixed 0.0.0-20260228130835-3a339e33191c

Ecosystem	Package	Introduced	Fixed
Go	github.com/pocket-id/pocket-id/backend	0	0.0.0-20260228130835-3a339e33191c

Remediation

No remediation recorded yet.

Weaknesses (1)

CWE-601

Open Redirect

References (4)

https://github.com/advisories/GHSA-9h33-g3ww-mqff
Advisory
https://github.com/pocket-id/pocket-id/commit/3a339e33191c31b68bf57db907f800d9de5ffbc8
x_refsource_MISCPatch
https://github.com/pocket-id/pocket-id/security/advisories/GHSA-9h33-g3ww-mqff
x_refsource_CONFIRMMitigationPatchVendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-28512

Link	Providers	Tags
https://github.com/advisories/GHSA-9h33-g3ww-mqff		Advisory
https://github.com/pocket-id/pocket-id/commit/3a339e33191c31b68bf57db907f800d9de5ffbc8		x_refsource_MISCPatch
https://github.com/pocket-id/pocket-id/security/advisories/GHSA-9h33-g3ww-mqff		x_refsource_CONFIRMMitigationPatchVendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2026-28512