Vulnerability · Published Mar 24, 2026 · Assigned by GitHub_M
CVE-2026-33700Vikunja has a Link Share Delete IDOR — Missing Project Ownership Check Allows Cross-Project Link Share Deletion
Medium 6.9
In plain English
A medium-severity authorization bypass via user-controlled key in vikunja from go-vikunja. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 18% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | code.vikunja.io/api | 2.2.1 | GHSA-f95f-77jx-fcjc |
| Go | code.vikunja.io/api | no fix listed | GO-2026-4850 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| go-vikunja | vikunja | < 2.2.1 |
Weakness: CWE-639 · Vector: 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
References
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-f95f-77jx-fcjc x_refsource_CONFIRM
- https://vikunja.io/changelog/vikunja-v2.2.2-was-released x_refsource_MISC