Improper Authentication Vulnerability in Vikunja Product by Vikunja
CVE-2026-123521

6MEDIUM

Key Information:

Vendor

Go-vikunja

Status
Vikunja
Vendor
CVE Published:
8 November 2026

What is CVE-2026-123521?

Vikunja versions prior to 2.7.1 are susceptible to an improper authentication vulnerability that permits session holders to execute brute-force attacks on account passwords. This is done through unthrottled re-authentication endpoints which allow attackers, holding a compromised session, to guess user passwords via the /user/settings/totp/disable endpoint. This vulnerability also enables attackers to disable Two-Factor Authentication (TOTP) without needing a verification code, thereby facilitating persistent account takeover.

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:
6
Severity:
MEDIUM
Confidentiality:
High
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Attack Required:
Physical
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

M7Saad
.