CVE-2026-55066High· 7.1▾ Twilight

Vikunja is an open-source self-hosted task management platform

▾ Twilight zone — High severity, or a signal on a lesser flaw

Depth score39/ 100 · Low

impact 39.1 · likelihood 0.1 · exploitation 0

⚡ Agent-ready:Raw markdown ↗JSON ↗

Proof of concept

Need a working PoC? Pro members can cast a request and our team develops one — it lands right here.

…

Published

Aug 28, 2026

Updated

Sep 9, 2026

CVSS

7.1

Vendor

api

Product

code.vikunja.io/api

CWE

CWE-639

Depth score

39 · Low

EPSS

0.27% · p19

Platforms

—

Source

NVD

Vector

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

EPSS history

Exploit-prediction probability, daily snapshots since Aug 29.

0.3% → 0.3%

Timeline

Disclosure to exploitation, from the record and what we observed since indexing it.

3 events · 12 days

Aug 28, 2026Published
Disclosed via NVD
Aug 29, 2026EPSS first tracked
0.3%
Sep 9, 2026Record revised
Last analysed / modified upstream

api CWE-639 #nvd #ghsa #go

Affected

code.vikunja.io/api <= 2.3.0

Patched in

code.vikunja.io/api 2.4.0

Full technical detail▾

Overview

Vikunja is an open-source self-hosted task management platform. Prior to 2.4.0, POST /api/v1/projects/{project}/views/{view}/buckets/{bucket}/tasks accepts a body supplied task_id but TaskBucket.CanUpdate in pkg/models/kanban_task_bucket.go authorizes only the project, view, and bucket from the URL. updateTaskBucket then calls Task.ReadOne without a separate task permission check, returns the victim task contents, and can update the task done state when the attacker chooses a done bucket. Because task identifiers are global sequential values, an authenticated user can enumerate cross-tenant tasks and modify their completion metadata through both the v1 and v2 routes that share this model. This issue is fixed in version 2.4.0.

Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.

Package advisory (CVE-2026-55066)

Affected packages:

code.vikunja.io/api <= 2.3.0

Patched in:

code.vikunja.io/api 2.4.0

Source: https://github.com/advisories/GHSA-5pg6-m483-7vrg

References

Related vulnerabilities

Connected by shared product, vendor, weakness, or advisory.

#nvd#ghsa#go

← Back to feed