Vulnerability-Lookup

CVE-2026-33668 (GCVE-0-2026-33668)

Vulnerability from cvelistv5 – Published: 2026-03-24 15:30 – Updated: 2026-03-26 19:52

Title

Vikunja Allows Disabled/Locked User Accounts to Authenticate via API Tokens, CalDAV, and OpenID Connect

Summary

Vikunja is an open-source self-hosted task management platform. Starting in version 0.18.0 and prior to version 2.2.1, when a user account is disabled or locked, the status check is only enforced on the local login and JWT token refresh paths. Three other authentication paths — API tokens, CalDAV basic auth, and OpenID Connect — do not verify user status, allowing disabled or locked users to continue accessing the API and syncing data. Version 2.2.1 patches the issue.

Severity ?

7.1 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

CWE

CWE-285 - Improper Authorization
CWE-863 - Incorrect Authorization

Assigner

GitHub_M

References

URL

Tags

	https://github.com/go-vikunja/vikunja/security/ad…	x_refsource_CONFIRM
	https://github.com/go-vikunja/vikunja/commit/0339…	x_refsource_MISC
	https://github.com/go-vikunja/vikunja/commit/0470…	x_refsource_MISC
	https://github.com/go-vikunja/vikunja/commit/0b04…	x_refsource_MISC
	https://github.com/go-vikunja/vikunja/commit/fd45…	x_refsource_MISC
	https://vikunja.io/changelog/vikunja-v2.2.2-was-r…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	go-vikunja	vikunja	Affected: >= 0.18.0, < 2.2.1

Show details on NVD website

JSON

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GHSA-94XM-JJ8X-3CR4

Vulnerability from github – Published: 2026-03-25 21:10 – Updated: 2026-03-25 21:10

Summary

Vikunja Allows Disabled/Locked User Accounts to Authenticate via API Tokens, CalDAV, and OpenID Connect

Details

Summary

When a user account is disabled or locked, the status check is only enforced on the local login and JWT token refresh paths. Three other authentication paths — API tokens, CalDAV basic auth, and OpenID Connect — do not verify user status, allowing disabled or locked users to continue accessing the API and syncing data.

Details

User status (StatusDisabled, StatusAccountLocked) is checked in only two places:

Local/LDAP login (pkg/routes/api/v1/login.go:74) — prevents issuing new JWTs
JWT token refresh (pkg/routes/api/v1/login.go:247) — prevents refreshing expired JWTs

Three other authentication paths fetch the user from the database via GetUserByID but never inspect the returned user's status:

1. API Token Authentication (`pkg/routes/api_tokens.go:76-103`)

API tokens are long-lived (up to years) and have no refresh cycle. A disabled user's API tokens remain fully functional until they expire naturally.

2. CalDAV Basic Auth (`pkg/routes/caldav/auth.go`)

The CalDAV basic auth handler validates credentials but does not check user status before granting access. A disabled user with valid credentials or a CalDAV token can continue syncing calendars and tasks.

3. OpenID Connect Callback (`pkg/modules/auth/openid/openid.go`)

The OIDC callback issues a fresh JWT token after validating the identity provider's response but does not check whether the Vikunja user account is disabled. If the user's identity provider session is still active, they receive a valid JWT despite being disabled in Vikunja.

Impact

An administrator who disables a user account expects that user to be immediately locked out. In practice:

API tokens: The user retains full API access for the remaining lifetime of any issued API tokens — potentially months or years.
CalDAV: The user can continue reading and writing tasks/events via any CalDAV client.
OIDC: The user can obtain a fresh, fully valid JWT by re-authenticating through their identity provider, completely bypassing the account disable.

Proof of Concept

Create a user and generate an API token.
Disable the user account via the admin API or CLI.
Make an API request using the API token: bash curl -H "Authorization: Bearer tk_<token>" https://vikunja.example/api/v1/user
The request succeeds with a 200 response despite the account being disabled.

Severity ?

7.1 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.2.0"
      },
      "package": {
        "ecosystem": "Go",
        "name": "code.vikunja.io/api"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.18.0"
            },
            {
              "fixed": "2.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-33668"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-285"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-25T21:10:05Z",
    "nvd_published_at": "2026-03-24T16:16:34Z",
    "severity": "HIGH"
  },
  "details": "## Summary\n\nWhen a user account is disabled or locked, the status check is only enforced on the local login and JWT token refresh paths. Three other authentication paths \u2014 API tokens, CalDAV basic auth, and OpenID Connect \u2014 do not verify user status, allowing disabled or locked users to continue accessing the API and syncing data.\n\n## Details\n\nUser status (`StatusDisabled`, `StatusAccountLocked`) is checked in only two places:\n\n1. **Local/LDAP login** (`pkg/routes/api/v1/login.go:74`) \u2014 prevents issuing new JWTs\n2. **JWT token refresh** (`pkg/routes/api/v1/login.go:247`) \u2014 prevents refreshing expired JWTs\n\nThree other authentication paths fetch the user from the database via `GetUserByID` but never inspect the returned user\u0027s status:\n\n### 1. API Token Authentication (`pkg/routes/api_tokens.go:76-103`)\n\nAPI tokens are long-lived (up to years) and have no refresh cycle. A disabled user\u0027s API tokens remain fully functional until they expire naturally.\n\n### 2. CalDAV Basic Auth (`pkg/routes/caldav/auth.go`)\n\nThe CalDAV basic auth handler validates credentials but does not check user status before granting access. A disabled user with valid credentials or a CalDAV token can continue syncing calendars and tasks.\n\n### 3. OpenID Connect Callback (`pkg/modules/auth/openid/openid.go`)\n\nThe OIDC callback issues a fresh JWT token after validating the identity provider\u0027s response but does not check whether the Vikunja user account is disabled. If the user\u0027s identity provider session is still active, they receive a valid JWT despite being disabled in Vikunja.\n\n## Impact\n\nAn administrator who disables a user account expects that user to be immediately locked out. In practice:\n\n- **API tokens**: The user retains full API access for the remaining lifetime of any issued API tokens \u2014 potentially months or years.\n- **CalDAV**: The user can continue reading and writing tasks/events via any CalDAV client.\n- **OIDC**: The user can obtain a fresh, fully valid JWT by re-authenticating through their identity provider, completely bypassing the account disable.\n\n## Proof of Concept\n\n1. Create a user and generate an API token.\n2. Disable the user account via the admin API or CLI.\n3. Make an API request using the API token:\n   ```bash\n   curl -H \"Authorization: Bearer tk_\u003ctoken\u003e\" https://vikunja.example/api/v1/user\n   ```\n4. The request succeeds with a 200 response despite the account being disabled.",
  "id": "GHSA-94xm-jj8x-3cr4",
  "modified": "2026-03-25T21:10:05Z",
  "published": "2026-03-25T21:10:05Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-94xm-jj8x-3cr4"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33668"
    },
    {
      "type": "WEB",
      "url": "https://github.com/go-vikunja/vikunja/commit/033922309f492996c928122fb49b691339199c35"
    },
    {
      "type": "WEB",
      "url": "https://github.com/go-vikunja/vikunja/commit/04704e0fde4b027039cf583110cee7afe136fc1b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/go-vikunja/vikunja/commit/0b04768d830c80e9fde1b0962db1499cc652da0e"
    },
    {
      "type": "WEB",
      "url": "https://github.com/go-vikunja/vikunja/commit/fd452b9cb6457fd4f9936527a14c359818f1cca7"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/go-vikunja/vikunja"
    },
    {
      "type": "WEB",
      "url": "https://vikunja.io/changelog/vikunja-v2.2.2-was-released"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Vikunja Allows Disabled/Locked User Accounts to Authenticate via API Tokens, CalDAV, and OpenID Connect"
}

FKIE_CVE-2026-33668

Vulnerability from fkie_nvd - Published: 2026-03-24 16:16 - Updated: 2026-03-27 16:44

Severity ?

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

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/go-vikunja/vikunja/commit/033922309f492996c928122fb49b691339199c35	Patch
security-advisories@github.com	https://github.com/go-vikunja/vikunja/commit/04704e0fde4b027039cf583110cee7afe136fc1b	Patch
security-advisories@github.com	https://github.com/go-vikunja/vikunja/commit/0b04768d830c80e9fde1b0962db1499cc652da0e	Patch
security-advisories@github.com	https://github.com/go-vikunja/vikunja/commit/fd452b9cb6457fd4f9936527a14c359818f1cca7	Patch
security-advisories@github.com	https://github.com/go-vikunja/vikunja/security/advisories/GHSA-94xm-jj8x-3cr4	Exploit, Vendor Advisory
security-advisories@github.com	https://vikunja.io/changelog/vikunja-v2.2.2-was-released	Release Notes

Impacted products

	Vendor	Product	Version
	vikunja	vikunja	*

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "10005EFC-4194-4C8F-B3B3-F890211F6B7A",
              "versionEndExcluding": "2.2.1",
              "versionStartIncluding": "0.18.0",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "Vikunja is an open-source self-hosted task management platform. Starting in version 0.18.0 and prior to version 2.2.1, when a user account is disabled or locked, the status check is only enforced on the local login and JWT token refresh paths. Three other authentication paths \u2014 API tokens, CalDAV basic auth, and OpenID Connect \u2014 do not verify user status, allowing disabled or locked users to continue accessing the API and syncing data. Version 2.2.1 patches the issue."
    },
    {
      "lang": "es",
      "value": "Vikunja es una plataforma de gesti\u00f3n de tareas de c\u00f3digo abierto autoalojada. A partir de la versi\u00f3n 0.18.0 y antes de la versi\u00f3n 2.2.1, cuando una cuenta de usuario est\u00e1 deshabilitada o bloqueada, la verificaci\u00f3n de estado solo se aplica en el inicio de sesi\u00f3n local y en las rutas de actualizaci\u00f3n de tokens JWT. Otras tres rutas de autenticaci\u00f3n \u2014 tokens de API, autenticaci\u00f3n b\u00e1sica de CalDAV y OpenID Connect \u2014 no verifican el estado del usuario, permitiendo que los usuarios deshabilitados o bloqueados contin\u00faen accediendo a la API y sincronizando datos. La versi\u00f3n 2.2.1 corrige el problema."
    }
  ],
  "id": "CVE-2026-33668",
  "lastModified": "2026-03-27T16:44:58.507",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.2,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "cvssMetricV40": [
      {
        "cvssData": {
          "Automatable": "NOT_DEFINED",
          "Recovery": "NOT_DEFINED",
          "Safety": "NOT_DEFINED",
          "attackComplexity": "LOW",
          "attackRequirements": "NONE",
          "attackVector": "NETWORK",
          "availabilityRequirement": "NOT_DEFINED",
          "baseScore": 7.1,
          "baseSeverity": "HIGH",
          "confidentialityRequirement": "NOT_DEFINED",
          "exploitMaturity": "NOT_DEFINED",
          "integrityRequirement": "NOT_DEFINED",
          "modifiedAttackComplexity": "NOT_DEFINED",
          "modifiedAttackRequirements": "NOT_DEFINED",
          "modifiedAttackVector": "NOT_DEFINED",
          "modifiedPrivilegesRequired": "NOT_DEFINED",
          "modifiedSubAvailabilityImpact": "NOT_DEFINED",
          "modifiedSubConfidentialityImpact": "NOT_DEFINED",
          "modifiedSubIntegrityImpact": "NOT_DEFINED",
          "modifiedUserInteraction": "NOT_DEFINED",
          "modifiedVulnAvailabilityImpact": "NOT_DEFINED",
          "modifiedVulnConfidentialityImpact": "NOT_DEFINED",
          "modifiedVulnIntegrityImpact": "NOT_DEFINED",
          "privilegesRequired": "LOW",
          "providerUrgency": "NOT_DEFINED",
          "subAvailabilityImpact": "NONE",
          "subConfidentialityImpact": "NONE",
          "subIntegrityImpact": "NONE",
          "userInteraction": "NONE",
          "valueDensity": "NOT_DEFINED",
          "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
          "version": "4.0",
          "vulnAvailabilityImpact": "NONE",
          "vulnConfidentialityImpact": "NONE",
          "vulnIntegrityImpact": "HIGH",
          "vulnerabilityResponseEffort": "NOT_DEFINED"
        },
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-03-24T16:16:34.623",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/go-vikunja/vikunja/commit/033922309f492996c928122fb49b691339199c35"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/go-vikunja/vikunja/commit/04704e0fde4b027039cf583110cee7afe136fc1b"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/go-vikunja/vikunja/commit/0b04768d830c80e9fde1b0962db1499cc652da0e"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Patch"
      ],
      "url": "https://github.com/go-vikunja/vikunja/commit/fd452b9cb6457fd4f9936527a14c359818f1cca7"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-94xm-jj8x-3cr4"
    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://vikunja.io/changelog/vikunja-v2.2.2-was-released"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-285"
        },
        {
          "lang": "en",
          "value": "CWE-863"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    }
  ]
}

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-2026-33668 (GCVE-0-2026-33668)

GHSA-94XM-JJ8X-3CR4

Summary

Details

1. API Token Authentication (pkg/routes/api_tokens.go:76-103)

2. CalDAV Basic Auth (pkg/routes/caldav/auth.go)

3. OpenID Connect Callback (pkg/modules/auth/openid/openid.go)

Impact

Proof of Concept

FKIE_CVE-2026-33668

Tags

Sightings

Nomenclature

1. API Token Authentication (`pkg/routes/api_tokens.go:76-103`)

2. CalDAV Basic Auth (`pkg/routes/caldav/auth.go`)

3. OpenID Connect Callback (`pkg/modules/auth/openid/openid.go`)