CVE-2026-35601— Vikunja has an iCalendar Property Injection via CRLF in CalDAV Task Output
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之前版本存在注入漏洞，该漏洞源于CalDAV输出生成器通过原始字符串拼接构建iCalendar条目时未应用RFC 5545 TEXT值转义，可能导致通过用户控制的标题注入任意iCalendar属性。
Possible ATT&CK Techniques 1 AI
T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2026-35601
Vulnerability Information
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Vulnerability Title
Vikunja has an iCalendar Property Injection via CRLF in CalDAV Task Output
Source: CVE Program / CVE List V5
Vulnerability Description
Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the CalDAV output generator builds iCalendar VTODO entries via raw string concatenation without applying RFC 5545 TEXT value escaping. User-controlled task titles containing CRLF characters break the iCalendar property boundary, allowing injection of arbitrary iCalendar properties such as ATTACH, VALARM, or ORGANIZER. 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:R/S:C/C:N/I:L/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
对CRLF序列的转义处理不恰当(CRLF注入)
Source: CVE Program / CVE List V5
Vulnerability Title
Vikunja 注入漏洞
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之前版本存在注入漏洞，该漏洞源于CalDAV输出生成器通过原始字符串拼接构建iCalendar条目时未应用RFC 5545 TEXT值转义，可能导致通过用户控制的标题注入任意iCalendar属性。
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-2026-35601
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-35601 (1)
Vendor Advisories for CVE-2026-35601 (1)
Vendor Pages for CVE-2026-35601 (1)
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Release v2.3.0 · go-vikunja/vikunja · GitHub x_refsource_MISC
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-2026-40103 | 4.3 MEDIUM | Vikunja's Scoped API tokens with projects.background permission can delete project backgro |
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