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CVE-2026-40103— Vikunja's Scoped API tokens with projects.background permission can delete project backgrounds

Quick assessment

Affected
go-vikunja vikunja
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

CVSS 4.3 · Medium EPSS 0.35% · P26

Possible ATT&CK Techniques 1 AI

T1528 · Steal Application Access Token
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
在认证机制中使用口令哈希代替口令
Source: CVE Program / CVE List V5
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

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III. Intelligence Information for CVE-2026-40103

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Patches & Fixes for CVE-2026-40103 (2)

Vendor Advisories for CVE-2026-40103 (1)

Vendor Pages for CVE-2026-40103 (1)

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
Same vendor: go-vikunja
Same weakness: CWE-836

V. Comments for CVE-2026-40103

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