CVE-2026-40103— Vikunja's Scoped API tokens with projects.background permission can delete project backgrounds
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I. Basic Information for CVE-2026-40103
Vulnerability Information
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Vulnerability Title
Vikunja's Scoped API tokens with projects.background permission can delete project backgrounds
Source: NVD (National Vulnerability Database)
Vulnerability Description
Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, Vikunja's scoped API token enforcement for custom project background routes is method-confused. A token with only projects.background can successfully delete a project background, while a token with only projects.background_delete is rejected. This is a scoped-token authorization bypass. This vulnerability is fixed in 2.3.0.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
在认证机制中使用口令哈希代替口令
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 2.3.0之前版本存在安全漏洞，该漏洞源于自定义项目背景路由的范围令牌授权混淆，可能导致授权绕过。
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 | < 2.3.0 | - |
II. Public POCs for CVE-2026-40103
| # | POC Description | Source Link | Shenlong Link |
|---|
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- Release v2.3.0 · go-vikunja/vikunja · GitHubx_refsource_MISC
- https://nvd.nist.gov/vuln/detail/CVE-2026-40103
Same Patch Batch · go-vikunja · 2026-04-10 · 11 CVEs total
| CVE-2026-35595 | 8.3 HIGH | Vikunja Affected by Privilege Escalation via Project Reparenting |
| CVE-2026-34727 | 7.4 HIGH | Vikunja ahs a TOTP Two-Factor Authentication Bypass via OIDC Login Path |
| CVE-2026-35594 | 6.5 MEDIUM | Vikunja Link Share JWT tokens remain valid for 72 hours after share deletion or permission |
| CVE-2026-35599 | 6.5 MEDIUM | Vikunja has an Algorithmic Complexity DoS in Repeating Task Handler |
| CVE-2026-35597 | 5.9 MEDIUM | Vikunja Affected by TOTP Brute-Force Due to Non-Functional Account Lockout |
| CVE-2026-35600 | 5.4 MEDIUM | Vikunja has HTML Injection via Task Titles in Overdue Email Notifications |
| CVE-2026-35602 | 5.4 MEDIUM | Vikunja has a File Size Limit Bypass via Vikunja Import |
| CVE-2026-35596 | 4.3 MEDIUM | Vikunja has Broken Access Control on Label Read via SQL Operator Precedence Bug |
| CVE-2026-35598 | 4.3 MEDIUM | Vikunja has Missing Authorization on CalDAV Task Read |
| CVE-2026-35601 | 4.1 MEDIUM | Vikunja has an iCalendar Property Injection via CRLF in CalDAV Task Output |
IV. Related Vulnerabilities
Same product: vikunja
- 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 - CVE-2026-35598
Vikunja has Missing Authorization on CalDAV Task Read
Same vendor: go-vikunja
- 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 - CVE-2026-35598
Vikunja has Missing Authorization on CalDAV Task Read
V. Comments for CVE-2026-40103
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