Pocket ID: The client credentials grant allows any OIDC client to obtain tokens for arbitrary audiences

Exploitation

No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.

CVSS

7.7 · CVSS:3.0/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:N

EPSS

• CVE-2026-62662: 0.27% estimated exploitation activity in the next 30 days; percentile 18.65 (FIRST EPSS, 2026-11-10). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

Summary The client credentials grant (`grant_type=client_credentials`) does not validate the resource parameter before embedding it as the aud claim in the issued JWT. Any authenticated OIDC client can obtain a Pocket ID-signed access token claiming authorization for any arbitrary audience, including other registered OIDC clients. There is no check that the requested audience is a registered resource server, and no check that the requesting client has been granted permission to access it.

Details In `backend/internal/service/oidc_service.go`, `createTokenFromClientCredentials` accepts the resource parameter from the token request and places it directly into the `aud` claim of the issued JWT without validation: ```golang audClaim := client.ID if input.Resource != "" { audClaim = input.Resource // no validation performed } accessToken, err := s.jwtService.GenerateOAuthAccessToken(dummyUser, audClaim) ``` The only guard in this function is `verifyClientCredentialsInternal`, which…

Published by the source

9 Nov 2026, 21:17 UTC

Last modified by the source

9 Nov 2026, 21:30 UTC

Source last checked

10 Nov 2026, 06:45 UTC

1. Revision 2 · amended · 10 Nov 2026

   Amended from osv record GHSA-q4xm-p75h-h9p3

2. Revision 1 · created · 9 Nov 2026

   Published from ghsa record GHSA-q4xm-p75h-h9p3

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# Patch Next advisory brief: CVE-2026-62662

Advisory: Pocket ID: The client credentials grant allows any OIDC client to obtain tokens for arbitrary audiences
IDs: CVE-2026-62662, GHSA-q4xm-p75h-h9p3
Record: https://patchnext.com/advisories/cve-2026-62662 (revision 2, source checked 10 Nov 2026, 06:45 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: github.com/pocket-id/pocket-id/backend 0.0.0-20260622164202-8158452b3730. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go github.com/pocket-id/pocket-id/backend: affected < 0.0.0-20260622164202-8158452b3730; fixed in 0.0.0-20260622164202-8158452b3730

## Suggested inspection (read-only)
- Go github.com/pocket-id/pocket-id/backend: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on github.com/pocket-id/pocket-id/backend.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-q4xm-p75h-h9p3 (GitHub-reviewed advisory GHSA-q4xm-p75h-h9p3 lists affected ranges: Go github.com/pocket-id/pocket-id/backend >=0 <0.0.0-20260622164202-8158452b3730)
- Verified: https://osv.dev/vulnerability/GHSA-q4xm-p75h-h9p3 (OSV record GHSA-q4xm-p75h-h9p3 lists affected ranges: Go github.com/pocket-id/pocket-id/backend >=0 <0.0.0-20260622164202-8158452b3730 (fixed))

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