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Medium severity · published Sep 15, 2026
CVE-2026-91980
vikunja before 2.6.0 Team Enumeration via Project Share
4.3
CVSS
0.3%
EPSS
No
On KEV
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.
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Attack vector
Network
Complexity
Low
Privileges
Low
User interaction
None
Confidentiality
Low
Integrity
None
Availability
None
Scope
Unchanged
Exploitation
Is it being used?
Exploit prediction (EPSS)0.3% · higher than 23% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
VI
vikunja · go-vikunja
before 2.6.0 · source: vendor
Affected product
VI
vikunja
go-vikunja
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-91980
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-91980
github.com
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-39p5-2wrr-xh29
www.vulncheck.com
https://www.vulncheck.com/advisories/vikunja-before-2.6.0-team-enumeration-via-project-share
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