CVE-2026-33676— Vikunja has Cross-Project Information Disclosure via Task Relations — Missing Authorization Check on Related Task Read
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I. Basic Information for CVE-2026-33676
Vulnerability Information
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Vulnerability Title
Vikunja has Cross-Project Information Disclosure via Task Relations — Missing Authorization Check on Related Task Read
Source: NVD (National Vulnerability Database)
Vulnerability Description
Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.1, when the Vikunja API returns tasks, it populates the `related_tasks` field with full task objects for all related tasks without checking whether the requesting user has read permission on those tasks' projects. An authenticated user who can read a task that has cross-project relations will receive full details (title, description, due dates, priority, percent completion, project ID, etc.) of tasks in projects they have no access to. Version 2.2.1 patches the issue.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制不正确
Source: NVD (National Vulnerability Database)
Vulnerability Title
Vikunja 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Vikunja是Vikunja开源的一个待办事项应用程序。 Vikunja 2.2.1之前版本存在安全漏洞，该漏洞源于返回相关任务时未检查读取权限，可能导致信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| go-vikunja | vikunja | < 2.2.1 | - |
II. Public POCs for CVE-2026-33676
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · go-vikunja · 2026-03-24 · 16 CVEs total
| CVE-2026-33316 | 8.1 HIGH | Vikunja’s Improper Access Control Enables Bypass of Administrator-Imposed Account Disablem |
| CVE-2026-33678 | 8.1 HIGH | Vikunja has IDOR in Task Attachment ReadOne Allows Cross-Project File Access and Deletion |
| CVE-2026-33680 | 7.5 HIGH | Vikunja Vulnerable to Link Share Hash Disclosure via ReadAll Endpoint Enables Permission E |
| CVE-2026-33474 | 6.5 MEDIUM | Vikunja Affected by DoS via Image Preview Generation |
| CVE-2026-33677 | 6.5 MEDIUM | Webhook BasicAuth Credentials Exposed to Read-Only Project Collaborators via API |
| CVE-2026-33675 | 6.4 MEDIUM | Vikunja has SSRF via Todoist/Trello Migration File Attachment URLs that Allows Reading Int |
| CVE-2026-33679 | 6.4 MEDIUM | Vikunja has SSRF via OpenID Connect Avatar Download that Bypasses Webhook SSRF Protections |
| CVE-2026-33473 | 5.7 MEDIUM | Vikunja has TOTP Reuse During Validity Window |
| CVE-2026-33315 | Vikunja has a 2FA Bypass via Caldav Basic Auth | |
| CVE-2026-33313 | Vikunja has an IDOR in Task Comments Allows Reading Arbitrary Comments | |
| CVE-2026-33335 | Vikunja Desktop allows arbitrary local application invocation via unvalidated shell.openEx | |
| CVE-2026-33334 | Vikunja Desktop: Any frontend XSS escalates to Remote Code Execution due to nodeIntegratio | |
| CVE-2026-33336 | Vikunja Desktop vulnerable to Remote Code Execution via same-window navigation | |
| CVE-2026-33668 | Vikunja Allows Disabled/Locked User Accounts to Authenticate via API Tokens, CalDAV, and O | |
| CVE-2026-33700 | Vikunja has a Link Share Delete IDOR — Missing Project Ownership Check Allows Cross-Projec |
IV. Related Vulnerabilities
Same product: vikunja
- CVE-2026-40103
Vikunja's Scoped API tokens with projects.background permiss - CVE-2026-35602
Vikunja has a File Size Limit Bypass via Vikunja Import - CVE-2026-35601
Vikunja has an iCalendar Property Injection via CRLF in CalD - CVE-2026-35600
Vikunja has HTML Injection via Task Titles in Overdue Email - CVE-2026-35599
Vikunja has an Algorithmic Complexity DoS in Repeating Task
Same vendor: go-vikunja
- CVE-2026-40103
Vikunja's Scoped API tokens with projects.background permiss - CVE-2026-35602
Vikunja has a File Size Limit Bypass via Vikunja Import - CVE-2026-35601
Vikunja has an iCalendar Property Injection via CRLF in CalD - CVE-2026-35600
Vikunja has HTML Injection via Task Titles in Overdue Email - CVE-2026-35599
Vikunja has an Algorithmic Complexity DoS in Repeating Task
Same weakness: CWE-863
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V. Comments for CVE-2026-33676
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