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

Exploitation

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

CVSS 4.0

9.3 · 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 · score source

EPSS

• CVE-2026-68582: 0.33% estimated exploitation activity in the next 30 days; percentile 26.23 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.

As published by the source; long descriptions are shortened.

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 createdby 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/taskcollection.go). 1. The view is resolved from the URL params before any permission check: GetProjectViewByIDAndProject…

Published by the source

9 Oct 2026, 20:42 UTC

Last modified by the source

19 Oct 2026, 21:31 UTC

Source last checked

26 Oct 2026, 15:32 UTC

1. Revision 4 · amended · 26 Oct 2026

   Amended from ghsa record GHSA-rj9j-8772-4h6c

2. Revision 3 · amended · 25 Oct 2026

   Reviewed OSV alias/range/CVSS4 correction; package source scopes and original publication preserved. No customer finding resolved.

3. Revision 2 · amended · 24 Oct 2026

   Amended from osv record GO-2026-6749

4. Revision 1 · created · 24 Oct 2026

   Published from osv record GHSA-rj9j-8772-4h6c

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2026-68582

Advisory: Vikunja: Link-share token reads any tenant's kanban buckets and enumerates usernames/IDs instance-wide (BOLA)
IDs: CVE-2026-68582, GHSA-rj9j-8772-4h6c
Record: https://patchnext.com/advisories/cve-2026-68582 (revision 4, source checked 26 Oct 2026, 15:32 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Critical (CVSS 9.3)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: code.vikunja.io/api 2.4.0. A vendor fix does not mean a deployment is fixed.

## Affected components
- Go code.vikunja.io/api: affected >= 0.24.0, <= 2.3.0; fixed in 2.4.0

## Suggested inspection (read-only)
- Go code.vikunja.io/api: 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 code.vikunja.io/api.
- 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://osv.dev/vulnerability/GO-2026-6749 (OSV record GO-2026-6749 lists affected ranges: Go code.vikunja.io/api >=0.24.0)
- Verified: https://osv.dev/vulnerability/GHSA-rj9j-8772-4h6c (OSV record GHSA-rj9j-8772-4h6c lists affected ranges: Go code.vikunja.io/api >=0.24.0 <2.4.0 (fixed))
- Verified: https://github.com/advisories/GHSA-rj9j-8772-4h6c (GitHub-reviewed advisory GHSA-rj9j-8772-4h6c lists affected ranges: Go code.vikunja.io/api >=0.24.0 <=2.3.0)

Commands are suggestions: review each one before running it.