Vikunja has HTML Injection via Task Titles in Overdue Email Notifications

Summary Task titles are embedded directly into Markdown link syntax in overdue email notifications without escaping Markdown special characters. When rendered by goldmark and sanitized by bluemonday which allows and tags, injected Markdown constructs produce phishing links and tracking pixels in...

Cross-site Scripting (XSS)

Overview Affected versions of this package are vulnerable to Cross-site Scripting XSS in the email notification rendering process. An attacker can inject arbitrary HTML content, such as phishing links or tracking images, by crafting malicious task titles that are embedded in notification emails...

Cross-site Scripting (XSS)

Overview Affected versions of this package are vulnerable to Cross-site Scripting XSS in the email notification rendering process. An attacker can inject arbitrary HTML content, such as phishing links or tracking images, by crafting malicious task titles that are embedded in notification emails...

EUVD-2026-21427

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

Cross-site Scripting (XSS)

Overview Affected versions of this package are vulnerable to Cross-site Scripting XSS in the email notification rendering process. An attacker can inject arbitrary HTML content, such as phishing links or tracking images, by crafting malicious task titles that are embedded in notification emails...

Cross-site Scripting (XSS)

Overview Affected versions of this package are vulnerable to Cross-site Scripting XSS in the email notification rendering process. An attacker can inject arbitrary HTML content, such as phishing links or tracking images, by crafting malicious task titles that are embedded in notification emails...

Cross-site Scripting (XSS)

Overview Affected versions of this package are vulnerable to Cross-site Scripting XSS in the email notification rendering process. An attacker can inject arbitrary HTML content, such as phishing links or tracking images, by crafting malicious task titles that are embedded in notification emails...

Cross-site Scripting (XSS)

Overview Affected versions of this package are vulnerable to Cross-site Scripting XSS in the email notification rendering process. An attacker can inject arbitrary HTML content, such as phishing links or tracking images, by crafting malicious task titles that are embedded in notification emails...

GHSA-45Q4-X4R9-8FQJ Vikunja has HTML Injection via Task Titles in Overdue Email Notifications

Summary Task titles are embedded directly into Markdown link syntax in overdue email notifications without escaping Markdown special characters. When rendered by goldmark and sanitized by bluemonday which allows and tags, injected Markdown constructs produce phishing links and tracking pixels in...

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...

Vikunja Missing Authorization on CalDAV Task Read

Summary 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...

GHSA-48CH-P4GQ-X46X Vikunja Missing Authorization on CalDAV Task Read

Summary 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...

EUVD-2026-21425

Vikunja Missing Authorization on CalDAV Task Read...

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...

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...

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...

Vikunja security vulnerabilities

Vikunja is an open-source to-do application developed by Vikunja. Versions of Vikunja prior to 2.3.0 contained security vulnerabilities. These vulnerabilities stemmed from the CalDAV method, which did not verify the user’s access rights to task items when retrieving tasks by UID. This could allow...

PT-2026-51979

Name of the Vulnerable Software and Affected Versions Linux kernel affected versions not specified Description A use-after-free flaw exists in the Berkeley Packet Filter BPF subsystem. The task vma iterator reads task-mm locklessly and acquires mmap read trylock without calling mmget. If a task...

Vikunja cross-site scripting vulnerabilities

Vikunja is an open-source to-do application developed by Vikunja developers. Versions of Vikunja prior to 2.3.0 had a cross-site scripting vulnerability. This vulnerability occurred when Markdown links were embedded in task titles in overdue email notifications without special characters being...