Mass Assignment Vulnerability in Vikunja by VIKUNJA
CVE-2026-123526

5.3MEDIUM

Key Information:

Vendor

Go-vikunja

Status
Vikunja
Vendor
CVE Published:
8 November 2026

What is CVE-2026-123526?

Vikunja prior to version 2.7.1 is susceptible to a mass assignment vulnerability that allows any authenticated user to manipulate the read-only external_id field. This can be exploited through the team creation and update endpoints, allowing attackers to label teams as externally managed. As a result, all members can be permanently blocked from removal, and single sign-on (SSO) members may find themselves removed from the team upon their next login.

Affected Version(s)

vikunja 0 < 2.7.1

vikunja 2.7.1

References

https://github.com/go-vikunja/vikunja/security/advisories...
vendor-advisory
https://www.vulncheck.com/advisories/vikunja-before-2.7.1...
third-party-advisory

CVSS V4

Score:
5.3
Severity:
MEDIUM
Confidentiality:
None
Integrity:
Low
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

EclipsSec
l1ght-man
.