CVE-2026-34727 Vikunja ahs a TOTP Two-Factor Authentication Bypass via OIDC Login Path

Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the OIDC callback handler issues a full JWT token without checking whether the matched user has TOTP two-factor authentication enabled. When a local user with TOTP enrolled is matched via the OIDC email fallback...

CVE-2026-34727 Vikunja ahs a TOTP Two-Factor Authentication Bypass via OIDC Login Path

Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the OIDC callback handler issues a full JWT token without checking whether the matched user has TOTP two-factor authentication enabled. When a local user with TOTP enrolled is matched via the OIDC email fallback...

CVE-2026-34727

Vikunja

Incorrect Authorization

Overview Affected versions of this package are vulnerable to Incorrect Authorization via improper authorization checks in the CanDoAPIRoute process. An attacker can delete project backgrounds by using an API token with only the projects.background permission, bypassing intended access controls fo...

GHSA-V479-VF79-MG83 Vikunja: Scoped API tokens with projects.background permission can delete project backgrounds

Summary 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.backgrounddelete is rejected. This is a scoped-token authorization bypass...

EUVD-2026-21494

Vikunja: Scoped API tokens with projects.background permission can delete project backgrounds...

GHSA-QH78-RVG3-CV54 Vikunja has File Size Limit Bypass via Vikunja Import

Summary The Vikunja file import endpoint uses the attacker-controlled Size field from the JSON metadata inside the import zip instead of the actual decompressed file content length for the file size enforcement check. By setting Size to 0 in the JSON while including large compressed file entries ...

Allocation of Resources Without Limits or Throttling

Overview Affected versions of this package are vulnerable to Allocation of Resources Without Limits or Throttling through the import process. An attacker can exhaust server storage and potentially cause service disruption by uploading compressed zip files containing files that exceed the configur...

EUVD-2026-21429

Vikunja has File Size Limit Bypass via Vikunja Import...

Vikunja has File Size Limit Bypass via Vikunja Import

Summary The Vikunja file import endpoint uses the attacker-controlled Size field from the JSON metadata inside the import zip instead of the actual decompressed file content length for the file size enforcement check. By setting Size to 0 in the JSON while including large compressed file entries ...

EUVD-2026-21428

Vikunja has iCalendar Property Injection via CRLF in CalDAV Task Output...

EUVD-2026-21427

Vikunja has HTML Injection via Task Titles in Overdue Email Notifications...

GHSA-R4FG-73RC-HHH7 Vikunja has Algorithmic Complexity DoS in Repeating Task Handler

Summary The addRepeatIntervalToTime function uses an On loop that advances a date by the task's RepeatAfter duration until it exceeds the current time. By creating a repeating task with a 1-second interval and a due date far in the past, an attacker triggers billions of loop iterations, consuming...

EUVD-2026-21426

Vikunja has Algorithmic Complexity DoS in Repeating Task Handler...

EUVD-2026-21425

Vikunja Missing Authorization on CalDAV Task Read...

EUVD-2026-21422

Vikunja Vulnerable to TOTP Brute-Force Due to Non-Functional Account Lockout...

GHSA-FGFV-PV97-6CMJ Vikunja Vulnerable to TOTP Brute-Force Due to Non-Functional Account Lockout

Summary The TOTP failed-attempt lockout mechanism is non-functional due to a database transaction handling bug. The account lock is written to the same database session that the login handler always rolls back on TOTP failure, so the lockout is triggered but never persisted. This allows unlimited...

Incorrect Authorization

Overview Affected versions of this package are vulnerable to Incorrect Authorization due to improper SQL operator precedence in the hasAccessToLabel function. An attacker can access label metadata, including titles, descriptions, colors, and creator information from projects they do not have acce...

EUVD-2026-21420

Vikunja has Broken Access Control on Label Read via SQL Operator Precedence Bug...

GHSA-HJ5C-MHH2-G7JQ Vikunja has Broken Access Control on Label Read via SQL Operator Precedence Bug

Summary The hasAccessToLabel function contains a SQL operator precedence bug that allows any authenticated user to read any label that has at least one task association, regardless of project access. Label titles, descriptions, colors, and creator information are exposed. Details The access contr...