Vulnerability-Lookup

CVE-2026-68581 (GCVE-0-2026-68581)

Vulnerability from cvelistv5 – Published: 2026-08-02 12:15 – Updated: 2026-08-03 15:02

Title

Vikunja 0.22.0 through 2.3.0 Authentication Bypass via Principal ID Collision

Summary

Vikunja versions 0.22.0 through 2.3.0 fail to validate the principal type in API token management. Because user IDs and link-share IDs are independent numeric sequences and both resolve through a generic web.Auth.GetID() interface, a link-share JWT whose numeric ID equals a target user's ID is treated as that user by the /api/v1/tokens endpoints. An authenticated attacker can obtain a target's numeric user ID via authenticated user search, then create link shares on an attacker-writable project until the link-share sequence reaches that value, and use the resulting link-share JWT to list, create, and delete the target user's API tokens (including issuing a new token with attacker-chosen scopes under the target's permissions). Fixed in version 2.4.0.

Severity

8.6 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

8.1 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-863 - Incorrect Authorization

Assigner

VulnCheck

References

4 references

URL	Tags
https://github.com/go-vikunja/vikunja/security/ad…	vendor-advisory
https://github.com/go-vikunja/vikunja/commit/e6b2…	patch
https://github.com/go-vikunja/vikunja/commit/95b7…	patch
https://www.vulncheck.com/advisories/vikunja-thro…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
go-vikunja	vikunja	Affected: 0.22.0 , < 2.4.0 (semver)

Date Public

2026-07-19 00:00

Credits

ryuyunseong

Show details on NVD website

JSON

To clipboard

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}

GHSA-9JRX-VMH8-C6XW

Vulnerability from github – Published: 2026-08-02 15:30 – Updated: 2026-08-02 15:30

Details

Severity

8.1 (High)


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

8.6 (High)


                  
                    CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N

Show details on source website

JSON

To clipboard

{
  "affected": [],
  "aliases": [
    "CVE-2026-68581"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-863"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-02T13:16:54Z",
    "severity": "HIGH"
  },
  "details": "Vikunja versions 0.22.0 through 2.3.0 fail to validate the principal type in API token management. Because user IDs and link-share IDs are independent numeric sequences and both resolve through a generic web.Auth.GetID() interface, a link-share JWT whose numeric ID equals a target user\u0027s ID is treated as that user by the /api/v1/tokens endpoints. An authenticated attacker can obtain a target\u0027s numeric user ID via authenticated user search, then create link shares on an attacker-writable project until the link-share sequence reaches that value, and use the resulting link-share JWT to list, create, and delete the target user\u0027s API tokens (including issuing a new token with attacker-chosen scopes under the target\u0027s permissions). Fixed in version 2.4.0.",
  "id": "GHSA-9jrx-vmh8-c6xw",
  "modified": "2026-08-02T15:30:21Z",
  "published": "2026-08-02T15:30:21Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-vvcv-vpph-h844"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-68581"
    },
    {
      "type": "WEB",
      "url": "https://github.com/go-vikunja/vikunja/commit/95b7e673fb5ee407498fa4b13e8b4c57847a4a0b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/go-vikunja/vikunja/commit/e6b25bd57b537ef9a72b5acdadf446ca5ef77bfa"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/vikunja-through-authentication-bypass-via-principal-id-collision"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

Sightings

Author	Source	Type	Date	Other

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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.

Action not permitted

CVE-2026-68581 (GCVE-0-2026-68581)

GHSA-9JRX-VMH8-C6XW

Tags

Sightings

Nomenclature