Vulnerability-Lookup

CVE-2026-33700 (GCVE-0-2026-33700)

Vulnerability from cvelistv5 – Published: 2026-03-24 15:51 – Updated: 2026-03-24 18:04

Title

Vikunja has a Link Share Delete IDOR — Missing Project Ownership Check Allows Cross-Project Link Share Deletion

Summary

Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.1, the `DELETE /api/v1/projects/:project/shares/:share` endpoint does not verify that the link share belongs to the project specified in the URL. An attacker with admin access to any project can delete link shares from other projects by providing their own project ID combined with the target share ID. Version 2.2.1 patches the issue.

Severity ?

6.9 (Medium)


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

CWE

CWE-639 - Authorization Bypass Through User-Controlled Key

Assigner

GitHub_M

References

URL

Tags

	https://github.com/go-vikunja/vikunja/security/ad…	x_refsource_CONFIRM
	https://vikunja.io/changelog/vikunja-v2.2.2-was-r…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	go-vikunja	vikunja	Affected: < 2.2.1

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-33700

Vulnerability from fkie_nvd - Published: 2026-03-24 16:16 - Updated: 2026-03-30 13:35

Severity ?

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

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/go-vikunja/vikunja/security/advisories/GHSA-f95f-77jx-fcjc	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": "E8647862-9C78-473D-9FED-7AFC24335A61",
              "versionEndExcluding": "2.2.1",
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    },
    {
      "lang": "es",
      "value": "Vikunja es una plataforma de gesti\u00f3n de tareas de c\u00f3digo abierto autoalojada. Antes de la versi\u00f3n 2.2.1, el endpoint `DELETE /api/v1/projects/:project/shares/:share` no verifica que el recurso compartido de enlace pertenezca al proyecto especificado en la URL. Un atacante con acceso de administrador a cualquier proyecto puede eliminar recursos compartidos de enlace de otros proyectos proporcionando su propio ID de proyecto combinado con el ID del recurso compartido objetivo. La versi\u00f3n 2.2.1 corrige el problema."
    }
  ],
  "id": "CVE-2026-33700",
  "lastModified": "2026-03-30T13:35:39.900",
  "metrics": {
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GHSA-F95F-77JX-FCJC

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

Summary

Vikunja has a Link Share Delete IDOR — Missing Project Ownership Check Allows Cross-Project Link Share Deletion

Details

Summary

The DELETE /api/v1/projects/:project/shares/:share endpoint does not verify that the link share belongs to the project specified in the URL. An attacker with admin access to any project can delete link shares from other projects by providing their own project ID combined with the target share ID.

Details

The permission check in canDoLinkShare (pkg/models/link_sharing_permissions.go:53-70) validates admin access on the project from the :project URL parameter. However, the Delete method at pkg/models/link_sharing.go:305 queries only WHERE id = ? using the share ID, without verifying it belongs to the URL-specified project:

func (share *LinkSharing) Delete(s *xorm.Session, _ web.Auth) (err error) {
    _, err = s.Where("id = ?", share.ID).Delete(share)
    return
}

This is the same vulnerability class as GHSA-jfmm-mjcp-8wq2 (task attachment IDOR) and the fixed GHSA-mr3j-p26x-72x4 (task comment IDOR).

Additionally, ReadOne at line 203 has the same pattern (WHERE id = ? only), though it is not currently exploitable because CanRead fails first due to an unrelated issue with the hash parameter binding.

Impact

An authenticated user with admin access to any project can: - Delete link shares belonging to any other project in the system - Disrupt collaboration by removing shared access links - Link share IDs are sequential integers, making enumeration trivial

Reproduction

User A creates Project A and a link share on it (share ID = X)
User B creates Project B (gaining admin access)
User B calls DELETE /api/v1/projects/{projectB_id}/shares/{X}
The permission check passes (User B is admin on Project B)
The delete executes WHERE id = X — deleting User A's link share

Recommended Fix

Change Delete at pkg/models/link_sharing.go:305 to:

_, err = s.Where("id = ? AND project_id = ?", share.ID, share.ProjectID).Delete(share)

Also fix ReadOne at line 203 as defense in depth.

Severity ?

6.9 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "package": {
        "ecosystem": "Go",
        "name": "code.vikunja.io/api"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-33700"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-639"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-25T21:21:20Z",
    "nvd_published_at": "2026-03-24T16:16:35Z",
    "severity": "MODERATE"
  },
  "details": "## Summary\n\nThe `DELETE /api/v1/projects/:project/shares/:share` endpoint does not verify that the link share belongs to the project specified in the URL. An attacker with admin access to any project can delete link shares from other projects by providing their own project ID combined with the target share ID.\n\n## Details\n\nThe permission check in `canDoLinkShare` (`pkg/models/link_sharing_permissions.go:53-70`) validates admin access on the project from the `:project` URL parameter. However, the `Delete` method at `pkg/models/link_sharing.go:305` queries only `WHERE id = ?` using the share ID, without verifying it belongs to the URL-specified project:\n\n```go\nfunc (share *LinkSharing) Delete(s *xorm.Session, _ web.Auth) (err error) {\n    _, err = s.Where(\"id = ?\", share.ID).Delete(share)\n    return\n}\n```\n\nThis is the same vulnerability class as GHSA-jfmm-mjcp-8wq2 (task attachment IDOR) and the fixed GHSA-mr3j-p26x-72x4 (task comment IDOR).\n\nAdditionally, `ReadOne` at line 203 has the same pattern (`WHERE id = ?` only), though it is not currently exploitable because `CanRead` fails first due to an unrelated issue with the hash parameter binding.\n\n## Impact\n\nAn authenticated user with admin access to any project can:\n- Delete link shares belonging to any other project in the system\n- Disrupt collaboration by removing shared access links\n- Link share IDs are sequential integers, making enumeration trivial\n\n## Reproduction\n\n1. User A creates Project A and a link share on it (share ID = X)\n2. User B creates Project B (gaining admin access)\n3. User B calls `DELETE /api/v1/projects/{projectB_id}/shares/{X}`\n4. The permission check passes (User B is admin on Project B)\n5. The delete executes `WHERE id = X` \u2014 deleting User A\u0027s link share\n\n## Recommended Fix\n\nChange `Delete` at `pkg/models/link_sharing.go:305` to:\n\n```go\n_, err = s.Where(\"id = ? AND project_id = ?\", share.ID, share.ProjectID).Delete(share)\n```\n\nAlso fix `ReadOne` at line 203 as defense in depth.",
  "id": "GHSA-f95f-77jx-fcjc",
  "modified": "2026-03-25T21:21:20Z",
  "published": "2026-03-25T21:21:20Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-f95f-77jx-fcjc"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33700"
    },
    {
      "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:H/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Vikunja has a Link Share Delete IDOR \u2014 Missing Project Ownership Check Allows Cross-Project Link Share Deletion"
}

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-2026-33700 (GCVE-0-2026-33700)

FKIE_CVE-2026-33700

GHSA-F95F-77JX-FCJC

Summary

Details

Impact

Reproduction

Recommended Fix

Tags

Sightings

Nomenclature