CVE-2026-91980

MEDIUM 4.3

vikunja before 2.6.0 Team Enumeration via Project Share

CVSS Score

4.3

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-200
Vendor	go-vikunja
Product	vikunja
Published	Sep 15, 2026
Last Updated	Sep 15, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

None

Affected Versions

go-vikunja / vikunja

0 < 2.6.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/go-vikunja/vikunja/security/advisories/GHSA-39p5-2wrr-xh29 vulncheck.com: https://www.vulncheck.com/advisories/vikunja-before-2.6.0-team-enumeration-via-project-share

Credits

🔍 0xcelien