Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1359 CNY

100%
Buy Us a Coffee

CVE-2026-33335— Vikunja Desktop allows arbitrary local application invocation via unvalidated shell.openExternal

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 0.21.0版本至2.2.0之前版本存在安全漏洞，该漏洞源于Vikunja Desktop Electron包装器将window.open()调用的URL直接传递给shell.openExternal()而未经任何验证或协议白名单过滤，可能导致攻击者通过用户生成内容中的链接触发受害者操作系统打开任意URI方案。

AI Predicted 5.3 Difficulty: Easy EPSS 0.37% · P29
Get alerts for future matching vulnerabilities Log in to subscribe

I. Basic Information for CVE-2026-33335

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
Vikunja Desktop allows arbitrary local application invocation via unvalidated shell.openExternal
Source: CVE Program / CVE List V5
Vulnerability Description
Vikunja is an open-source self-hosted task management platform. Starting in version 0.21.0 and prior to version 2.2.0, the Vikunja Desktop Electron wrapper passes URLs from `window.open()` calls directly to `shell.openExternal()` without any validation or protocol allowlisting. An attacker who can place a link with `target="_blank"` (or that otherwise triggers `window.open`) in user-generated content can cause the victim's operating system to open arbitrary URI schemes, invoking local applications, opening local files, or triggering custom protocol handlers. Version 2.2.0 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H
Source: CVE Program / CVE List V5
Vulnerability Type
自定义URL方案处理程序中的授权不正确
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 0.21.0版本至2.2.0之前版本存在安全漏洞，该漏洞源于Vikunja Desktop Electron包装器将window.open()调用的URL直接传递给shell.openExternal()而未经任何验证或协议白名单过滤，可能导致攻击者通过用户生成内容中的链接触发受害者操作系统打开任意URI方案。
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 >= 0.21.0, < 2.2.0 -

II. Public POCs for CVE-2026-33335

# POC Description Source Link Shenlong Link
AI-Generated POC Premium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2026-33335

请登录查看更多情报信息。

Vendor Advisories for CVE-2026-33335 (1)

Vendor Pages for CVE-2026-33335 (1)

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-2026-33680 7.5 HIGH Vikunja Vulnerable to Link Share Hash Disclosure via ReadAll Endpoint Enables Permission E
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-2026-33334 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
Same vendor: go-vikunja
Same weakness: CWE-939

V. Comments for CVE-2026-33335

No comments yet

Leave a comment