What is CVE-2026-91980?

CVE-2026-91980 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Information Disclosure. CVSS score: 4.3/10. Published 2026-09-15.

How severe is CVE-2026-91980?

Medium severity. CVSS v3 base score is 4.3 out of 10.

Information disclosure in Go-Vikunja Vikunja

CVE-2026-91980

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.

Vulnerability class: Information Disclosure

CVSS v3 metric

CVSS v3 base score 4.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N.

Affected products

Go-vikunja Vikunja

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

disclosure@vulncheck.com (vendor-advisory)
disclosure@vulncheck.com (third-party-advisory)

Frequently asked questions

What is CVE-2026-91980?: CVE-2026-91980 is a medium-severity vulnerability in Go-Vikunja Vikunja, classified under Information Disclosure. CVSS score: 4.3/10. Published 2026-09-15.
How severe is CVE-2026-91980?: Medium severity. CVSS v3 base score is 4.3 out of 10.