CVE-2026-123526

MEDIUM 5.4

Vikunja before 2.7.1 Mass Assignment via Team external_id Field

CVSS Score

5.4

EPSS Score

0.0%

EPSS Percentile

0th

Vikunja before 2.7.1 contains a mass assignment vulnerability that allows any authenticated user to set the read-only external_id field through the team create and update endpoints. Attackers can tag a team they create or administer as externally managed, permanently blocking removal of every member and causing SSO members to be dropped from the team at their next login.

CWE	CWE-915
Vendor	go-vikunja
Product	vikunja
Published	Nov 8, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

Low

Affected Versions

go-vikunja / vikunja

0 < 2.7.1

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/go-vikunja/vikunja/security/advisories/GHSA-fjrf-gjmg-9v6g vulncheck.com: https://www.vulncheck.com/advisories/vikunja-before-2.7.1-mass-assignment-via-team-external-id-field

Credits

🔍 EclipsSec 🔍 l1ght-man