Vulnerability · Published Nov 8, 2026 · Assigned by VulnCheck
CVE-2026-123526Vikunja before 2.7.1 Mass Assignment via Team external_id Field
Medium 5.4
In plain English
A medium-severity security flaw in vikunja from go-vikunja. There are no confirmed reports of exploitation so far.
Severity (CVSS 3.1)5.4Medium
Exploit odds (30 days)–no EPSS score yet
Exploited in the wildNo reportsnot in CISA KEV
Attack toolingNoneno public tooling known
Official description
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.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| go-vikunja | vikunja | 0 – before 2.7.1 |
Weakness: CWE-915 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
References
- GitHub Security Advisory (GHSA-fjrf-gjmg-9v6g) vendor-advisory
- VulnCheck Advisory: Vikunja before 2.7.1 Mass Assignment via Team external_id Field third-party-advisory