Vulnerability-Lookup

GHSA-RJ9J-8772-4H6C

Vulnerability from github – Published: 2026-10-09 20:42 – Updated: 2026-10-09 20:42

Summary

Vikunja: Link-share token reads any tenant's kanban buckets and enumerates usernames/IDs instance-wide (BOLA)

Details

Summary

The task-collection endpoint GET /api/v1/projects/{project}/views/{view}/tasks loads the requested project view straight from the URL path without verifying the caller is authorized for it. For a link-share token, the task query is correctly pinned to the share's own project, but the view is taken from the attacker-controlled path and never re-validated against the share. A holder of a share link to any project can therefore point the endpoint at any other tenant's kanban view and receive that view's bucket records — bucket titles plus the full created_by user object (username, name, id) — for every view in the instance. The same missing pre-authorization view load also yields a project/view-ID existence oracle (404 vs. non-404) usable by link shares and ordinary authenticated users alike.

Details

Root cause is in TaskCollection.ReadAll (pkg/models/task_collection.go).

The view is resolved from the URL params before any permission check:

// pkg/models/task_collection.go  (ReadAll)
if tf.ProjectViewID != 0 {
    view, err = GetProjectViewByIDAndProject(s, tf.ProjectViewID, tf.ProjectID) // (URL params)
    ...
}

GetProjectViewByIDAndProject (pkg/models/project_view.go) filters only on WHERE id = ? AND project_id = ? — it performs no authorization. A valid (project, view) pair returns the view; an invalid pair returns ErrProjectViewDoesNotExist (HTTP 404).

For a link-share caller, the code pins the task scope to the token's own project but reuses the attacker-supplied view:

shareAuth, is := a.(*LinkSharing)
if is {
    project, err := GetProjectSimpleByID(s, shareAuth.ProjectID)   // token's project
    ...
    return getTaskOrTasksInBuckets(s, a, []*Project{project}, view, opts, filteringForBucket, tf.forceFlatTasks)
    // `view` is the foreign, attacker-controlled view — never validated against shareAuth.ProjectID
}

getTaskOrTasksInBuckets → GetTasksInBucketsForView (pkg/models/kanban.go) reads the buckets of that foreign view directly:

err = s.Where("project_view_id = ?", view.ID).OrderBy("position").Find(&buckets)
...
users, err := getUsersOrLinkSharesFromIDs(s, userIDs) // resolves each bucket's created_by

Each returned Bucket serializes CreatedBy *user.User as json:"created_by" (pkg/models/kanban.go), exposing the creating user's username, name, and id.

The normal (non-share) path is protected because it runs getRelevantProjectsFromCollection, which calls project.CanRead on the URL project and returns 403 before any bucket data is produced. Only the LinkSharing branch skips that gate, which is why the bucket disclosure is link-share-specific. ReadAllWeb (pkg/web/handler/read_all.go) performs no permission check of its own, so all authorization for this endpoint lives inside ReadAll.

Scope of the leak (verified against fixtures): the tasks returned inside the buckets are still constrained to the share's own project (getRawTasksForProjects filters tasks.project_id IN opts.projectIDs, derived from the share's project). So victim task contents do not leak; what leaks is the foreign view's bucket structure and, critically, the created_by user identities of arbitrary buckets instance-wide.

Introduced in v0.24.0 by the per-view kanban feature (feat(views)!: return tasks in buckets by view), which added the views/{view}/tasks endpoint and the foreign-view bucket load. The link-share branch predates it, but the two only combine into this bug from v0.24.0 onward.

Impact

A holder of a link-share token to any single project (link shares are designed to be handed out, often semi-publicly) can:

Enumerate all project and view IDs instance-wide. IDs are sequential auto-increment integers; an invalid (project, view) pair returns 404 while a valid one returns 200, giving a reliable existence oracle across all tenants.
Disclose the created_by user of any kanban view's buckets — username, display name, and user id. Because Vikunja auto-creates a default project with a Kanban view for every user, iterating view IDs enumerates usernames and user IDs for essentially every account on the instance.
Disclose bucket titles of every kanban view in the instance.

This is a cross-tenant broken-object-level-authorization bypass. It does not disclose victim task contents through this path, but instance-wide username/user-id enumeration plus kanban structure disclosure is a meaningful PII and reconnaissance exposure that defeats the tenant isolation the permission model is meant to enforce. The ID-enumeration oracle additionally works for any ordinary authenticated user (invalid combo → 404 vs. inaccessible combo → 403), because the view is loaded before the CanRead check.

Proof of Concept

Prerequisites: link sharing enabled (default), a share link to any project (call it project A), and any second project B (e.g. another tenant's) with a kanban view V_B.

Authenticate the share link to obtain a share JWT: POST /api/v1/shares/{shareHash}/auth
Using that token, request a foreign kanban view's tasks: GET /api/v1/projects/{B}/views/{V_B}/tasks
The 200 response is a list of Bucket objects belonging to view V_B — each with title and a populated created_by (username, name, id) — even though the token has no relationship to project B.
Iterate {B}/{V_B} over sequential integers: valid pairs return bucket lists (harvest usernames/ids), invalid pairs return 404.

Verified locally against the model fixtures: a LinkSharing{ProjectID: 1} (project 1 owned by user 1) calling TaskCollection{ProjectID: 2, ProjectViewID: 8}.ReadAll (project 2 owned by user 3) returns project 2's buckets ("testbucket4 - other project", "testbucket40") with their created_by user objects populated, and no error — while a nonexistent view id returns ErrProjectViewDoesNotExist.

Recommended Fix

In TaskCollection.ReadAll, before the view is loaded, pin the requested project to the link share's own project so any foreign view resolves to a 404 instead of leaking:

if shareAuth, is := a.(*LinkSharing); is {
    tf.ProjectID = shareAuth.ProjectID
}

This is consistent with the existing behavior that already forces the task query to shareAuth.ProjectID, and it closes both the bucket disclosure and the share-token half of the enumeration oracle. As defence-in-depth, resolve the view's authorization against the authenticated caller for every auth type (not just link shares), so the endpoint never loads a view the caller cannot read — closing the 404-vs-403 existence oracle for ordinary users as well.

Severity

9.3 (Critical)


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

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{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c= 2.3.0"
      },
      "package": {
        "ecosystem": "Go",
        "name": "code.vikunja.io/api"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.24.0"
            },
            {
              "fixed": "2.4.0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-68582"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-639",
      "CWE-863"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-10-09T20:42:33Z",
    "nvd_published_at": null,
    "severity": "CRITICAL"
  },
  "details": "## Summary\n\nThe task-collection endpoint `GET /api/v1/projects/{project}/views/{view}/tasks` loads the requested project view straight from the URL path without verifying the caller is authorized for it. For a **link-share token**, the task query is correctly pinned to the share\u0027s own project, but the *view* is taken from the attacker-controlled path and never re-validated against the share. A holder of a share link to **any** project can therefore point the endpoint at any other tenant\u0027s kanban view and receive that view\u0027s bucket records \u2014 bucket titles plus the full `created_by` user object (username, name, id) \u2014 for every view in the instance. The same missing pre-authorization view load also yields a project/view-ID existence oracle (404 vs. non-404) usable by link shares and ordinary authenticated users alike.\n\n## Details\n\nRoot cause is in `TaskCollection.ReadAll` (`pkg/models/task_collection.go`).\n\n1. The view is resolved from the URL params before any permission check:\n\n```go\n// pkg/models/task_collection.go  (ReadAll)\nif tf.ProjectViewID != 0 {\n    view, err = GetProjectViewByIDAndProject(s, tf.ProjectViewID, tf.ProjectID) // (URL params)\n    ...\n}\n```\n\n`GetProjectViewByIDAndProject` (`pkg/models/project_view.go`) filters only on `WHERE id = ? AND project_id = ?` \u2014 it performs no authorization. A valid `(project, view)` pair returns the view; an invalid pair returns `ErrProjectViewDoesNotExist` (HTTP 404).\n\n2. For a link-share caller, the code pins the *task* scope to the token\u0027s own project but reuses the attacker-supplied `view`:\n\n```go\nshareAuth, is := a.(*LinkSharing)\nif is {\n    project, err := GetProjectSimpleByID(s, shareAuth.ProjectID)   // token\u0027s project\n    ...\n    return getTaskOrTasksInBuckets(s, a, []*Project{project}, view, opts, filteringForBucket, tf.forceFlatTasks)\n    // `view` is the foreign, attacker-controlled view \u2014 never validated against shareAuth.ProjectID\n}\n```\n\n3. `getTaskOrTasksInBuckets` \u2192 `GetTasksInBucketsForView` (`pkg/models/kanban.go`) reads the buckets of that foreign view directly:\n\n```go\nerr = s.Where(\"project_view_id = ?\", view.ID).OrderBy(\"position\").Find(\u0026buckets)\n...\nusers, err := getUsersOrLinkSharesFromIDs(s, userIDs) // resolves each bucket\u0027s created_by\n```\n\nEach returned `Bucket` serializes `CreatedBy *user.User` as `json:\"created_by\"` (`pkg/models/kanban.go`), exposing the creating user\u0027s username, name, and id.\n\nThe normal (non-share) path is protected because it runs `getRelevantProjectsFromCollection`, which calls `project.CanRead` on the URL project and returns 403 before any bucket data is produced. Only the `LinkSharing` branch skips that gate, which is why the bucket disclosure is link-share-specific. `ReadAllWeb` (`pkg/web/handler/read_all.go`) performs no permission check of its own, so all authorization for this endpoint lives inside `ReadAll`.\n\nScope of the leak (verified against fixtures): the *tasks* returned inside the buckets are still constrained to the share\u0027s own project (`getRawTasksForProjects` filters `tasks.project_id IN opts.projectIDs`, derived from the share\u0027s project). So victim task **contents do not leak**; what leaks is the foreign view\u0027s bucket structure and, critically, the `created_by` user identities of arbitrary buckets instance-wide.\n\nIntroduced in v0.24.0 by the per-view kanban feature (`feat(views)!: return tasks in buckets by view`), which added the `views/{view}/tasks` endpoint and the foreign-view bucket load. The link-share branch predates it, but the two only combine into this bug from v0.24.0 onward.\n\n## Impact\n\nA holder of a link-share token to any single project (link shares are designed to be handed out, often semi-publicly) can:\n\n- **Enumerate all project and view IDs instance-wide.** IDs are sequential auto-increment integers; an invalid `(project, view)` pair returns 404 while a valid one returns 200, giving a reliable existence oracle across all tenants.\n- **Disclose the `created_by` user of any kanban view\u0027s buckets** \u2014 username, display name, and user id. Because Vikunja auto-creates a default project with a Kanban view for every user, iterating view IDs enumerates usernames and user IDs for essentially every account on the instance.\n- **Disclose bucket titles** of every kanban view in the instance.\n\nThis is a cross-tenant broken-object-level-authorization bypass. It does not disclose victim task contents through this path, but instance-wide username/user-id enumeration plus kanban structure disclosure is a meaningful PII and reconnaissance exposure that defeats the tenant isolation the permission model is meant to enforce. The ID-enumeration oracle additionally works for any ordinary authenticated user (invalid combo \u2192 404 vs. inaccessible combo \u2192 403), because the view is loaded before the `CanRead` check.\n\n## Proof of Concept\n\nPrerequisites: link sharing enabled (default), a share link to any project (call it project A), and any second project B (e.g. another tenant\u0027s) with a kanban view V_B.\n\n1. Authenticate the share link to obtain a share JWT:\n   `POST /api/v1/shares/{shareHash}/auth`\n2. Using that token, request a foreign kanban view\u0027s tasks:\n   `GET /api/v1/projects/{B}/views/{V_B}/tasks`\n3. The 200 response is a list of `Bucket` objects belonging to view `V_B` \u2014 each with `title` and a populated `created_by` (username, name, id) \u2014 even though the token has no relationship to project B.\n4. Iterate `{B}`/`{V_B}` over sequential integers: valid pairs return bucket lists (harvest usernames/ids), invalid pairs return 404.\n\nVerified locally against the model fixtures: a `LinkSharing{ProjectID: 1}` (project 1 owned by user 1) calling `TaskCollection{ProjectID: 2, ProjectViewID: 8}.ReadAll` (project 2 owned by user 3) returns project 2\u0027s buckets (`\"testbucket4 - other project\"`, `\"testbucket40\"`) with their `created_by` user objects populated, and no error \u2014 while a nonexistent view id returns `ErrProjectViewDoesNotExist`.\n\n## Recommended Fix\n\nIn `TaskCollection.ReadAll`, before the view is loaded, pin the requested project to the link share\u0027s own project so any foreign view resolves to a 404 instead of leaking:\n\n```go\nif shareAuth, is := a.(*LinkSharing); is {\n    tf.ProjectID = shareAuth.ProjectID\n}\n```\n\nThis is consistent with the existing behavior that already forces the task query to `shareAuth.ProjectID`, and it closes both the bucket disclosure and the share-token half of the enumeration oracle. As defence-in-depth, resolve the view\u0027s authorization against the authenticated caller for every auth type (not just link shares), so the endpoint never loads a view the caller cannot read \u2014 closing the 404-vs-403 existence oracle for ordinary users as well.",
  "id": "GHSA-rj9j-8772-4h6c",
  "modified": "2026-10-09T20:42:33Z",
  "published": "2026-10-09T20:42:33Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-rj9j-8772-4h6c"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68582"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/go-vikunja/vikunja"
    },
    {
      "type": "WEB",
      "url": "https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/vikunja-broken-object-level-authorization-via-link-share-token"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    }
  ],
  "summary": "Vikunja: Link-share token reads any tenant\u0027s kanban buckets and enumerates usernames/IDs instance-wide (BOLA)"
}

CVE-2026-68582 (GCVE-0-2026-68582)

Vulnerability from cvelistv5 – Published: 2026-08-02 12:15 – Updated: 2026-08-03 19:57

Title

Vikunja 0.24.0 Broken Object Level Authorization via Link-Share Token

Summary

Vikunja versions >= 0.24.0 and <= 2.3.0 contain a broken object level authorization (BOLA) vulnerability in the task-collection endpoint (GET /api/v1/projects/{project}/views/{view}/tasks). The endpoint loads the requested project view from the URL path without verifying the caller is authorized for it. For a link-share token holder, the task scope is pinned to the share's own project, but the view is taken from the attacker-controlled path and never re-validated. As a result, a holder of any project share link can read any other tenant's kanban bucket records — bucket titles and the full created_by user object (username, name, id) — for every view in the instance. The same missing pre-authorization view load also creates a project/view-ID existence oracle (404 vs. non-404) usable by link shares and ordinary authenticated users. Task contents remain constrained to the share's own project and are not disclosed. Fixed in 2.4.0.

Severity

9.3 (Critical)


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

6.5 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-03 19:56 UTC

CWE

CWE-639 - Authorization Bypass Through User-Controlled Key

Assigner

VulnCheck mitre root Scorecard

References

2 references

URL	Tags
https://github.com/go-vikunja/vikunja/security/ad…	vendor-advisory
https://www.vulncheck.com/advisories/vikunja-brok…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
go-vikunja	vikunja	Affected: 0.24.0 , < 2.4.0 (semver) cpe:2.3:a:vikunja:vikunja::::::::

Date Public

2026-07-19 00:00

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

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Action not permitted

GHSA-RJ9J-8772-4H6C

Summary

Details

Impact

Proof of Concept

Recommended Fix

CVE-2026-68582 (GCVE-0-2026-68582)

Tags

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