CVE-2026-33678 Details
Description
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.
An Insecure Direct Object Reference (IDOR) vulnerability has been identified in Vikunja, a self-hosted task management platform, in versions prior to 2.2.1. The issue arises in the `TaskAttachment.ReadOne()` method, which retrieves attachments based solely on their ID, without considering the task ID from the URL. This oversight allows authenticated users to access or delete attachments from tasks in different projects by manipulating the task and attachment IDs. The vulnerability is exacerbated by the sequential nature of attachment IDs, which facilitates easy enumeration of all attachments in the system.
Users can upgrade to Vikunja version 2.2.1 or later, where this vulnerability has been patched.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
CISA-ADP
Assessed Mar 24, 2026References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://github.com/go-vikunja/vikunja/security/advisories/GHSA-jfmm-mjcp-8wq2 | [email protected] | ExploitVendor Advisory |
| https://vikunja.io/changelog/vikunja-v2.2.2-was-released | [email protected] | Release Notes |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-639 | Authorization Bypass Through User-Controlled Key | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| vikunja vikunja | < 2.2.1 |
CPE
Remediation
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Change History
4 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jun 17, 2026 | CVE Modified | [email protected] |
| Jun 17, 2026 | CVE Modified | CISA-ADP |
| Mar 30, 2026 | Initial Analysis | [email protected] |
| Mar 24, 2026 | New CVE Received | [email protected] |