CVE-2026-33668— Vikunja Allows Disabled/Locked User Accounts to Authenticate via API Tokens, CalDAV, and OpenID Connect
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 0.18.0至2.2.1之前版本存在安全漏洞，该漏洞源于部分认证路径未验证用户状态，可能导致已禁用或锁定用户继续访问API。
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I. Basic Information for CVE-2026-33668
Vulnerability Information
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Vulnerability Title
Vikunja Allows Disabled/Locked User Accounts to Authenticate via API Tokens, CalDAV, and OpenID Connect
Source: CVE Program / CVE List V5
Vulnerability Description
Vikunja is an open-source self-hosted task management platform. Starting in version 0.18.0 and prior to version 2.2.1, when a user account is disabled or locked, the status check is only enforced on the local login and JWT token refresh paths. Three other authentication paths — API tokens, CalDAV basic auth, and OpenID Connect — do not verify user status, allowing disabled or locked users to continue accessing the API and syncing data. Version 2.2.1 patches the issue.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制不恰当
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 0.18.0至2.2.1之前版本存在安全漏洞，该漏洞源于部分认证路径未验证用户状态，可能导致已禁用或锁定用户继续访问API。
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 | >= 0.18.0, < 2.2.1 | - |
|
II. Public POCs for CVE-2026-33668
| # | POC Description | Source Link | Shenlong Link |
|---|
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Patches & Fixes for CVE-2026-33668 (4)
Vendor Advisories for CVE-2026-33668 (1)
Vendor Pages for CVE-2026-33668 (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-2026-33335 | Vikunja Desktop allows arbitrary local application invocation via unvalidated shell.openEx | |
| 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-2026-33700 | Vikunja has a Link Share Delete IDOR — Missing Project Ownership Check Allows Cross-Projec |
IV. Related Vulnerabilities
Same product: vikunja
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CVE-2026-91984
Vikunja before 2.6.0 Broken Object-Level Authorization via t -
CVE-2026-91985
Vikunja before 2.6.0 Privilege Escalation via Link Share Has -
CVE-2026-91983
Vikunja before 2.6.0 API Token Scope Bypass via expand Param -
CVE-2026-91982
Vikunja before 2.6.0 TOTP Secret Disclosure via API -
CVE-2026-91981
Vikunja before 2.6.0 User Enumeration via v2 API
Same vendor: go-vikunja
-
CVE-2026-91985
Vikunja before 2.6.0 Privilege Escalation via Link Share Has -
CVE-2026-91984
Vikunja before 2.6.0 Broken Object-Level Authorization via t -
CVE-2026-91983
Vikunja before 2.6.0 API Token Scope Bypass via expand Param -
CVE-2026-91981
Vikunja before 2.6.0 User Enumeration via v2 API -
CVE-2026-91982
Vikunja before 2.6.0 TOTP Secret Disclosure via API
Same weakness: CWE-285
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onetwothreeneth HospitalManagementSystem Account Administrat -
CVE-2026-105284
Totolink A3002MU Authentication Check boa sub_40FCFC imprope -
CVE-2026-105121
OpenAM before 16.1.3 Improper Authorization in Delegated Ses -
CVE-2026-105119
OpenAM before 16.1.3 PKCE Enforcement Bypass via OAuth 2.0 H -
CVE-2026-103858
MISP Incomplete Thread Authorization Allows Unauthorized Rea
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