CVE-2026-43983 Pocket ID: OIDC refresh token flow bypasses authorization revocation, account disabling, and group restrictions

What is CVE-2026-43983?

CVE-2026-43983 is a high-severity authentication bypass vulnerability in pocket-id, published on 12 May 2026. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.

Official description

Pocket ID is an OIDC provider that allows users to authenticate with their passkeys to your services. Prior to 2.6.0, The createTokenFromRefreshToken function (oidc_service.go) validates the refresh token's cryptographic integrity but does not re-validate the user's current authorization state before issuing new tokens. This allows (1) the client to refresh the token indefinitely after authorization revocation, (2) the refresh token to continue to work after the account is disabled, and (3) the token to work after the client is removed from the group. This vulnerability is fixed in 2.6.0.

Weakness: CWE-613, CWE-285

Which versions are affected by CVE-2026-43983?

3 open source packages ship an affected version, including github.com/pocket-id/pocket-id/backend. It affects 1 product.

Products include Pocket-Id Pocket Id.

How do I fix CVE-2026-43983?

Upgrade github.com/pocket-id/pocket-id/backend to 0.0.0-20260419162744-978ac87deffe or later.

Upgrade, and rotate credentials and sessions that may have been exposed. More about Authentication bypass.

Is CVE-2026-43983 being exploited?

It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-43983 exists.

Other vulnerabilities in pocket-id

• CVE-2026-28513 Pocket ID: OIDC authorization code validation uses AND instead of OR, allowing cross-client token exchange High 8.5
• CVE-2026-28512 Pocket ID: OAuth redirect_uri validation bypass via userinfo/host confusion High 7.1

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-w6p7-2fxx-4f44, GO-2026-6119.