Vikunja has TOTP Reuse During Validity Window

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Vikunja is an open-source self-hosted task management platform. Starting in version 0.13 and prior to version 2.2.1, any user that has enabled 2FA can have their TOTP reused during the standard 30 second validity window. Version 2.2.1 patches the issue.

Source published

24 Mar 2026 15:18:14 UTC

Source modified

24 Mar 2026 17:11:26 UTC

Saved here

23 Oct 2026 15:48:27 UTC

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CVSS 3.1 · 5.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

Vikunja is an open-source self-hosted task management platform. Starting in version 0.13 and prior to version 2.2.1, any user that has enabled 2FA can have their TOTP reused during the standard 30 second validity window. Version 2.2.1 patches the issue.

Source published

Mar 24, 2026, 3:18:14 PM (timezone not stated)

Source modified

Mar 24, 2026, 5:11:26 PM (timezone not stated)

Saved here

15 Nov 2026 10:03:24 UTC

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EUVD CVSS 3.1 · 5.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

Vikunja is an open-source self-hosted task management platform. Starting in version 0.13 and prior to version 2.2.1, any user that has enabled 2FA can have their TOTP reused during the standard 30 second validity window. Version 2.2.1 patches the issue.

Source published

24 Mar 2026 16:16:33 UTC

Source modified

17 Jun 2026 10:37:33 UTC

Saved here

25 Oct 2026 08:17:18 UTC

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CVSS 3.1 · [email protected] · Secondary · 5.7 CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

### Summary Any user that has enabled 2FA can have their TOTP reused during the standard 30 second validity window. ### Details The below code is called when a user that has 2FA is authenticating to the application. Once they submit a valid username-password-totp combination, the user gets authenticated. If that same TOTP is used for the same user's account again within the validity window, it will allow the other session to authenticate successfully. **Source**: <ins>pkg/user/totp.go:128</ins> ```go // ValidateTOTPPasscode validated totp codes of users. func ValidateTOTPPasscode(s *xorm.Session, passcode *TOTPPasscode) (t *TOTP, err error) { t, err = GetTOTPForUser(s, passcode.User) if err != nil { return } if !totp.Validate(passcode.Passcode, t.Secret) { return nil, ErrInvalidTOTPPasscode{Passcode: passcode.Passcode} } return } ``` Section 6.5.1 within the [Authentication](https://github.com/OWASP/ASVS/blob/master/5.0/en/0x15-V6-Authentication.md) section of the OWASP ASVS recommends multiple checks, some of which involving TOTPs: > Verify that lookup secrets, out-of-band authentication requests or codes, and time-based one-time passwords (TOTPs) are only successfully usable once. The OWASP WSTG also references this as one of their [checks](https://owasp.org/www-project-web-security-testing-guide/latest/4-Web_Application_Security_Testing/04-Authentication_Testing/11-Testing_Multi-Factor_Authentication) to look for: > Can the OTPs be used more than once? ### PoC https://github.com/user-attachments/assets/19d3b4c3-c219-4f59-b57d-45c9f6a264c8 ### Impact Any user who uses 2FA could be impacted if their traffic is able to be captured, they're phished/social engineered, or other methods of attack. This disrupts one layer of the defense-in-depth model surrounding 2FA. ### Similar CVEs - [CVE-2025-6014](https://nvd.nist.gov/vuln/detail/CVE-2025-6014) - [CVE-2025-55003](https://nvd.nist.gov/vuln/detail/CVE-2025-55003) ### Remediation Store a deny-list of TOTP codes for their validity windows and check submitted codes against it to ensure none are being reused. After their validity window has closed, the 2FA code can be removed from the list.

Source published

20 Mar 2026 20:43:00 UTC

Source modified

10 Sep 2026 03:50:40 UTC

Saved here

24 Oct 2026 13:19:41 UTC

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GitHub Advisory Database · CC-BY-4.0

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CVSS_V3 · CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

Publisher rating · MODERATE

Vikunja has TOTP Reuse During Validity Window in code.vikunja.io/api. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. (If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.) The additional affected modules and versions are: .

Source published

23 Mar 2026 18:16:18 UTC

Source modified

23 Mar 2026 18:45:23 UTC

Saved here

24 Oct 2026 13:19:41 UTC

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OSV · upstream source license applies

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