Vulnerability · Published Sep 15, 2026 · Assigned by VulnCheck
CVE-2026-91984Vikunja before 2.6.0 Broken Object-Level Authorization via task-position
Medium 4.3
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.
Severity (CVSS 3.1)4.3Medium
Exploit odds (30 days)0.3%top 81.6% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
Vikunja before 2.6.0 fails to validate that user-supplied project_view_id in task-position requests belongs to the task's project. Authenticated attackers can insert task position rows into arbitrary other tenant project views via POST or PUT task-position endpoints.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | code.vikunja.io/api | 2.6.0 | GHSA-w39f-h553-h2mx |
| Go | code.vikunja.io/api | no fix listed | GO-2026-6755 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| go-vikunja | vikunja | 0 – before 2.6.0 |
Weakness: CWE-639 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
References
- GitHub Security Advisory (GHSA-w39f-h553-h2mx) vendor-advisory
- VulnCheck Advisory: Vikunja before 2.6.0 Broken Object-Level Authorization via task-position third-party-advisory