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CVE-2026-35598— Vikunja has Missing Authorization on CalDAV Task Read

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CalDAV方法在按UID获取任务时未验证用户对任务项目的访问权限，可能导致任何经过身份验证的CalDAV用户读取任意项目中的完整任务数据。

CVSS 4.3 · Medium EPSS 0.35% · P26

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System
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I. Basic Information for CVE-2026-35598

Vulnerability Information
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Vulnerability Title
Vikunja has Missing Authorization on CalDAV Task Read
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 GetResource and GetResourcesByList methods fetch tasks by UID from the database without verifying that the authenticated user has access to the task's project. Any authenticated CalDAV user who knows (or guesses) a task UID can read the full task data from any project on the instance. 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:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
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CalDAV方法在按UID获取任务时未验证用户对任务项目的访问权限，可能导致任何经过身份验证的CalDAV用户读取任意项目中的完整任务数据。
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-2026-35598

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III. Intelligence Information for CVE-2026-35598

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Patches & Fixes for CVE-2026-35598 (2)

Vendor Advisories for CVE-2026-35598 (1)

Vendor Pages for CVE-2026-35598 (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-2026-40103 4.3 MEDIUM Vikunja's Scoped API tokens with projects.background permission can delete project backgro
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-862

V. Comments for CVE-2026-35598

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