Vulnerability · Published Nov 8, 2026 · Assigned by VulnCheck
CVE-2026-123521Vikunja before 2.7.1 Password Brute-Force via TOTP Disable Endpoint
Medium 5.9
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)5.9Medium
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 an improper restriction of excessive authentication attempts vulnerability that allows session holders to brute-force account passwords via unthrottled re-authentication endpoints. Attackers with a stolen session can guess the password via /user/settings/totp/disable without lockout, then disable TOTP without a code for persistent account takeover.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| go-vikunja | vikunja | 0 – before 2.7.1 |
Weakness: CWE-307 · Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:H/I:L/A:N
References
- GitHub Security Advisory (GHSA-49pj-52x6-8gpj) vendor-advisory
- VulnCheck Advisory: Vikunja before 2.7.1 Password Brute-Force via TOTP Disable Endpoint third-party-advisory