Vulnerability-Lookup

CVE-2026-33473 (GCVE-0-2026-33473)

Vulnerability from cvelistv5 – Published: 2026-03-24 15:18 – Updated: 2026-03-24 17:11

Title

Vikunja has TOTP Reuse During Validity Window

Summary

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.

Severity ?

5.7 (Medium)


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

CWE

CWE-287 - Improper Authentication

Assigner

GitHub_M

References

URL

Tags

	https://github.com/go-vikunja/vikunja/security/ad…	x_refsource_CONFIRM
	https://vikunja.io/changelog/vikunja-v2.2.0-was-r…	x_refsource_MISC
	https://vikunja.io/changelog/vikunja-v2.2.2-was-r…	x_refsource_MISC

Impacted products

	Vendor	Product	Version
	go-vikunja	vikunja	Affected: >= 0.13, < 2.2.1

Show details on NVD website

JSON

To clipboard

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GHSA-P747-QC5P-773R

Vulnerability from github – Published: 2026-03-20 20:43 – Updated: 2026-03-25 20:34

Summary

Vikunja has TOTP Reuse During Validity Window

Details

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: pkg/user/totp.go:128

// 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 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 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

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.

Severity ?

5.7 (Medium)


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

Show details on source website

JSON

To clipboard

{
  "affected": [
    {
      "database_specific": {
        "last_known_affected_version_range": "\u003c 2.2.1"
      },
      "package": {
        "ecosystem": "Go",
        "name": "code.vikunja.io/api"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0.13"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "aliases": [
    "CVE-2026-33473"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-287"
    ],
    "github_reviewed": true,
    "github_reviewed_at": "2026-03-20T20:43:00Z",
    "nvd_published_at": "2026-03-24T16:16:33Z",
    "severity": "MODERATE"
  },
  "details": "### Summary\nAny user that has enabled 2FA can have their TOTP reused during the standard 30 second validity window.\n\n### Details\nThe 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\u0027s account again within the validity window, it will allow the other session to authenticate successfully.\n\n**Source**: \u003cins\u003epkg/user/totp.go:128\u003c/ins\u003e\n```go\n// ValidateTOTPPasscode validated totp codes of users.\nfunc ValidateTOTPPasscode(s *xorm.Session, passcode *TOTPPasscode) (t *TOTP, err error) {\n\tt, err = GetTOTPForUser(s, passcode.User)\n\tif err != nil {\n\t\treturn\n\t}\n\n\tif !totp.Validate(passcode.Passcode, t.Secret) {\n\t\treturn nil, ErrInvalidTOTPPasscode{Passcode: passcode.Passcode}\n\t}\n\n\treturn\n}\n```\n\nSection 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:\n\n\u003e Verify that lookup secrets, out-of-band authentication requests or codes, and time-based one-time passwords (TOTPs) are only successfully usable once.\n\nThe 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:\n\n\u003e Can the OTPs be used more than once?\n\n### PoC\n\nhttps://github.com/user-attachments/assets/19d3b4c3-c219-4f59-b57d-45c9f6a264c8\n\n### Impact\nAny user who uses 2FA could be impacted if their traffic is able to be captured, they\u0027re phished/social engineered, or other methods of attack. This disrupts one layer of the defense-in-depth model surrounding 2FA.\n\n### Similar CVEs\n\n- [CVE-2025-6014](https://nvd.nist.gov/vuln/detail/CVE-2025-6014)\n- [CVE-2025-55003](https://nvd.nist.gov/vuln/detail/CVE-2025-55003)\n\n### Remediation\n\nStore 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.",
  "id": "GHSA-p747-qc5p-773r",
  "modified": "2026-03-25T20:34:07Z",
  "published": "2026-03-20T20:43:00Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-p747-qc5p-773r"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-33473"
    },
    {
      "type": "PACKAGE",
      "url": "https://github.com/go-vikunja/vikunja"
    },
    {
      "type": "WEB",
      "url": "https://vikunja.io/changelog/vikunja-v2.2.0-was-released"
    },
    {
      "type": "WEB",
      "url": "https://vikunja.io/changelog/vikunja-v2.2.2-was-released"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N",
      "type": "CVSS_V3"
    }
  ],
  "summary": "Vikunja has TOTP Reuse During Validity Window"
}

FKIE_CVE-2026-33473

Vulnerability from fkie_nvd - Published: 2026-03-24 16:16 - Updated: 2026-03-27 16:53

Severity ?

5.7 (Medium) - CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N

Summary

References

URL	Tags
security-advisories@github.com	https://github.com/go-vikunja/vikunja/security/advisories/GHSA-p747-qc5p-773r	Exploit, Vendor Advisory
security-advisories@github.com	https://vikunja.io/changelog/vikunja-v2.2.0-was-released	Release Notes
security-advisories@github.com	https://vikunja.io/changelog/vikunja-v2.2.2-was-released	Release Notes

Impacted products

	Vendor	Product	Version
	vikunja	vikunja	*

JSON

To clipboard

{
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "A9EDB458-A25F-4E79-A8D5-340826D95EB6",
              "versionEndExcluding": "2.2.1",
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              "vulnerable": true
            }
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          "negate": false,
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  ],
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    {
      "lang": "en",
      "value": "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."
    },
    {
      "lang": "es",
      "value": "Vikunja es una plataforma de gesti\u00f3n de tareas de c\u00f3digo abierto autoalojada. A partir de la versi\u00f3n 0.13 y antes de la versi\u00f3n 2.2.1, cualquier usuario que haya habilitado 2FA puede ver su TOTP reutilizado durante la ventana de validez est\u00e1ndar de 30 segundos. La versi\u00f3n 2.2.1 corrige el problema."
    }
  ],
  "id": "CVE-2026-33473",
  "lastModified": "2026-03-27T16:53:32.720",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 5.7,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "REQUIRED",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N",
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        "impactScore": 3.6,
        "source": "security-advisories@github.com",
        "type": "Secondary"
      }
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  },
  "published": "2026-03-24T16:16:33.710",
  "references": [
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Exploit",
        "Vendor Advisory"
      ],
      "url": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-p747-qc5p-773r"
    },
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      "tags": [
        "Release Notes"
      ],
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    },
    {
      "source": "security-advisories@github.com",
      "tags": [
        "Release Notes"
      ],
      "url": "https://vikunja.io/changelog/vikunja-v2.2.2-was-released"
    }
  ],
  "sourceIdentifier": "security-advisories@github.com",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-287"
        }
      ],
      "source": "security-advisories@github.com",
      "type": "Primary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}

Sightings

Author	Source	Type	Date

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CVE-2026-33473 (GCVE-0-2026-33473)

GHSA-P747-QC5P-773R

Summary

Details

PoC

Impact

Similar CVEs

Remediation

FKIE_CVE-2026-33473

Tags

Sightings

Nomenclature