CVE-2026-123520 · Runtime
NO FIX YET · SEE WHAT TO DO
Vikunja, a self-hosted task manager, lets a team owner create a bot, add it to a team, and delete it, which promotes read-only shared projects so the attacker gains admin or ownership and can lock out the real owner. The result is that an attacker takes control of projects they were only allowed to view.
first public Oct 22, 2026 · 1 source
Check it with your coding agent
It checks your repository and tells you if you’re affected, with the fix.
Teams running self-hosted Vikunja from 0.18.0 up to but not including 2.7.1 that share projects read-only with other users. Instances on 2.7.1 or later, or with no team sharing, are not exposed. The sources do not say whether managed hosting is affected.
Not affected if no-team-sharing, version-2.7.1-or-later
Who cares self-hosted, team-sharing, vikunja
0.18.0 before 2.7.1.2.7.1 or later.Vikunja from 0.18.0 before 2.7.1 contains a privilege escalation vulnerability that allows team owners to gain admin or ownership of read-only shared projects by deleting accounts. Attackers can create a bot, add it to their team, and delete it through the bots endpoint, triggering ensureProjectAdminUser to promote read-only shares and lock out the real owner.
This page as .md · .json · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/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
NVD data is provided by NIST and is public domain. Posts quoted belong to their authors.
Are you affected?
Tell InfraStack what you run. It checks this one, and every next one, against your stack.
Ask from here. InfraStack checks the affected versions against your stack and answers in your inbox.
InfraStack checks the affected versions against your stack and answers in Slack, with the evidence and the fix.