CVE-2026-28512: high-severity vulnerability in pocket-id
Pocket ID: OAuth redirect_uri validation bypass via userinfo/host confusion
Published · Updated
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21Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 7.1epss 0.2%
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.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:L/A:N
Affected products
pocket-id · pocket-idRelated CVEs — pocket-id
In the same product, most dangerous first.
CVE-2026-55834MEDIUMPocket ID: Open Redirect on the OIDC /authorize page via unvalidated redirect_uri with prompt=noneEPSS 0.4%CVE-2026-28513HIGHPocket ID: OIDC authorization code validation uses AND instead of OR, allowing cross-client token exchangeEPSS 0.3%CVE-2026-43983HIGHPocket ID: OIDC refresh token flow bypasses authorization revocation, account disabling, and group restrictionsEPSS 0.2%