Answer in brief
CVE-2026-91984 records a Medium severity (CVSS 4.3) vulnerability in Vikunja before 2.6.0 Broken Object-Level Authorization via task-position. The current sources do not mark it as known exploited. The current feed maps go-vikunja/vikunja (generic), code.vikunja.io/api (go), code.vikunja.io/api (go), code.vikunja.io/api (go). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 4.3. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps go-vikunja/vikunja (generic), code.vikunja.io/api (go), code.vikunja.io/api (go), code.vikunja.io/api (go). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| go-vikunja/vikunjageneric | >=0 <2.6.0 | 2.6.0 |
| code.vikunja.io/apigo | <=2.5.0 | 2.6.0 |
| code.vikunja.io/apigo | >=0 <2.6.0 | 2.6.0 |
| code.vikunja.io/apigo | >=0 | Not reported |
Published upstream
Sep 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 19, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Sep 15, 2026
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.
Quoted source text, attributed separately from HOL analysis.