CVE-2026-123517 · Package
NO FIX YET · SEE WHAT TO DO
Vikunja before 2.7.1 lets any logged-in user probe the team member self-removal endpoint with arbitrary team ids. The distinct responses reveal whether a private team exists, is SSO-managed, or has a single member.
first public Oct 22, 2026 · 1 source
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Any self-hosted or shared Vikunja instance older than 2.7.1 where users have accounts can probe for private team ids. Instances without user accounts, or running 2.7.1 or later, are not affected by this signal.
Not affected if no-user-accounts, version-2.7.1-or-later
Who cares self-hosted, teams, vikunja
2.7.1.2.7.1 or later.Vikunja before 2.7.1 contains an information disclosure vulnerability that allows authenticated users to determine whether private teams exist by calling the team member self-removal endpoint. Attackers can send DELETE requests to /teams/{id}/members/{own username} for arbitrary team ids and use the distinguishable responses to learn if a team exists, is SSO-managed, or has a single member.
This page as .md · .json · CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:N/VA:N/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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