CVE-2026-123511 · Package
NO FIX YET · SEE WHAT TO DO
Vikunja before 2.7.1 lets a logged-in CalDAV client send a single calendar to-do item with thousands of RELATED-TO properties, and each unknown related ID creates a task. An attacker can bloat the database and overload the event pipeline, which can slow or disrupt the service.
first public Oct 22, 2026 · 1 source
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Self-hosted or managed Vikunja instances where users can connect CalDAV clients. An attacker needs a valid account, so instances with open registration or many accounts face more risk. Instances without CalDAV use or with only trusted users are less exposed.
Not affected if auth-required, managed-hosting, no-caldav
Who cares caldav, self-hosted, vikunja
Unknown from the sources.
2.7.1 or later.Vikunja before 2.7.1 contains an uncontrolled resource consumption vulnerability that allows authenticated CalDAV clients to create unbounded dummy tasks by sending VTODOs with thousands of RELATED-TO properties. Attackers can repeat unknown related UIDs in a single PUT request to generate thousands of task, relation, and event rows, bloating the database and overloading the event pipeline.
This page as .md · .json · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
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