CVE-2026-91980 vikunja before 2.6.0 Team Enumeration via Project Share
Authenticated users can enumerate all teams and members by attaching arbitrary team IDs to projects, exposing sensitive roster data.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-91980?
CVE-2026-91980 is a medium-severity vulnerability in go-vikunja vikunja, published on 15 Sep 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
vikunja before 2.6.0 fails to validate team access when attaching teams to projects, allowing authenticated users to enumerate all teams and members. Attackers can attach arbitrary team IDs via the project teams endpoint to retrieve complete team rosters including member names and admin flags for unauthorized teams.
Weakness: CWE-200
Which versions are affected by CVE-2026-91980?
3 open source packages ship an affected version, including code.vikunja.io/api.
| Package | Affected | Fixed in |
|---|---|---|
code.vikunja.io/api Go | All versions | None |
code.vikunja.io/api Go | All versions | 2.6.0 |
code.vikunja.io/api Go | All versions | 2.6.0 |
How do I fix CVE-2026-91980?
Upgrade code.vikunja.io/api to 2.6.0 or later.
Is CVE-2026-91980 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-91980 exists.
Sources
Also known as GHSA-39p5-2wrr-xh29, GO-2026-6713.