CVE-2026-33678

Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.1, `TaskAttachment.ReadOne()` queries attachments by ID only (`WHERE id = ?`), ignoring the task ID from the URL path. The permission check in `CanRead()` validates access to the task specified in the URL, but `ReadOne()` loads a different attachment that may belong to a task in another project. This allows any authenticated user to download or delete any attachment in the system by providing their own accessible task ID with a target attachment ID. Attachment IDs are sequential integers, making enumeration trivial. Version 2.2.1 patches the issue.

CVSS v3 8.1 HIGH

8.1^/10

CVSS v3 : HIGH

Vector :

Exploitability : 2.8 / Impact : 5.2

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact NONE

Scope UNCHANGED

References

Link	Resource
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-jfmm-mjcp-8wq2	Exploit Vendor Advisory
https://vikunja.io/changelog/vikunja-v2.2.2-was-released	Release Notes

Configurations

Configuration 1 (hide)

cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-03-24 16:16

Updated : 2026-06-17 10:37

NVD link : CVE-2026-33678

Mitre link : CVE-2026-33678

CVE.ORG link : CVE-2026-33678

JSON object : View

Products Affected

vikunja

vikunja

CWE

CWE-639

Authorization Bypass Through User-Controlled Key

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