CVE-2026-33680— Vikunja Vulnerable to Link Share Hash Disclosure via ReadAll Endpoint Enables Permission Escalation
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I. Basic Information for CVE-2026-33680
Vulnerability Information
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Vulnerability Title
Vikunja Vulnerable to Link Share Hash Disclosure via ReadAll Endpoint Enables Permission Escalation
Source: NVD (National Vulnerability Database)
Vulnerability Description
Vikunja is an open-source self-hosted task management platform. Prior to version 2.2.2, the `LinkSharing.ReadAll()` method allows link share authenticated users to list all link shares for a project, including their secret hashes. While `LinkSharing.CanRead()` correctly blocks link share users from reading individual shares via `ReadOne`, the `ReadAllWeb` handler bypasses this check by never calling `CanRead()`. An attacker with a read-only link share can retrieve hashes for write or admin link shares on the same project and authenticate with them, escalating to full admin access. Version 2.2.2 patches the issue.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制不恰当
Source: NVD (National Vulnerability Database)
Vulnerability Title
Vikunja 授权问题漏洞
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 2.2.2之前版本存在授权问题漏洞，该漏洞源于LinkSharing.ReadAll方法允许列出所有链接共享，可能导致权限提升。
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 | < 2.2.2 | - |
II. Public POCs for CVE-2026-33680
| # | 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-2026-33474 | 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-2026-33676 | 6.5 MEDIUM | Vikunja has Cross-Project Information Disclosure via Task Relations — Missing Authorizatio |
| 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-285
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V. Comments for CVE-2026-33680
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