GHSA-ccgq-fx7h-2v4c: Duplicate Advisory Vikunja: Cross-tenant Task-position Rows Can Vulnerability

MODERATE
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CVSS 4.3
CWE-639
Published
Advisory Summary

GHSA-ccgq-fx7h-2v4c is a MODERATE (CVSS 4.3) vikunja: cross-tenant task-position rows can vulnerability (CWE-639: Authorization Bypass Through User-Controlled Key) affecting Duplicate Advisory libraries in the Go ecosystem. The issue involves vikunja: cross-tenant task-position rows can be injected into arbitrary project views via the unvalidated project_view_id in the task position endpoint (v1 and v2). Remediation is available in the latest vendor maintenance releases.

GHSA-ccgq-fx7h-2v4c at a Glance

CVE Identifier N/A
GHSA Identifier GHSA-ccgq-fx7h-2v4c
Severity MODERATE
CVSS v3.1 Base Score 4.3
CWE Classification CWE-639: Authorization Bypass Through User-Controlled Key
Affected Product Duplicate Advisory
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 4.3

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required Low (PR:L)
User Interaction None (UI:N)
Scope Unchanged (S:U)
Confidentiality None (C:N)
Integrity Low (I:L)
Availability None (A:N)

How to Fix GHSA-ccgq-fx7h-2v4c

To remediate this vulnerability, upgrade all affected Duplicate Advisory dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

code.vikunja.io/api fixed: Latest secure release 
Upgrade code.vikunja.io/api to Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for code.vikunja.io/api

How to Check if You Are Affected

To determine whether your application is affected by GHSA-ccgq-fx7h-2v4c, inspect your project dependencies for Duplicate Advisory:

inspect dependencies for code.vikunja.io/api

Analyze the terminal output to locate any version of Duplicate Advisory in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than the patched release), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-639: Authorization Bypass Through User-Controlled Key, where the system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data. In Duplicate Advisory, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Duplicate Advisory This advisory has been withdrawn because it is a duplicate of GHSA-w39f-h553-h2mx. This link is maintained to preserve external references. ### Original Description Vikunja before 2.6.0 fails to validate that user-supplied project_view_id in task-position requests belongs to the task's project. Authenticated attackers can insert task position rows into arbitrary other tenant project views via POST or PUT task-position endpoints.

GHSA-ccgq-fx7h-2v4c Affected Duplicate Advisory Versions

1 component(s)
Product / Package Ecosystem Affected Versions Fixed Version
code.vikunja.io/api
golang/code.vikunja.io/api
Go
≤ 2.5.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/go-vikunja/vikunja/security/advisories/GHSA-w39f-h553-h2mx
NVD — GHSA-ccgq-fx7h-2v4c NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-91984
www.vulncheck.com/advisories/vikunja-... WEB
https://www.vulncheck.com/advisories/vikunja-before-2.6.0-broken-object-level-authorization-via-task-position

Frequently Asked Questions

What is GHSA-ccgq-fx7h-2v4c?
GHSA-ccgq-fx7h-2v4c is a security vulnerability in Duplicate Advisory involving Vikunja: Cross-tenant task-position rows can be injected into arbitrary project views via the unvalidated project_view_id in the task position endpoint (v1 and v2) under CWE-639: Authorization Bypass Through User-Controlled Key.
Which Duplicate Advisory versions are affected?
Affected versions include releases prior to current release patches across affected packages: code.vikunja.io/api.
What version fixes GHSA-ccgq-fx7h-2v4c?
Upgrading to current release patches (or the latest patched release for your respective branch) resolves the vulnerability.
Is code.vikunja.io/api affected?
Yes, code.vikunja.io/api is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of GHSA-ccgq-fx7h-2v4c?
GHSA-ccgq-fx7h-2v4c has a CVSS v3.1 base score of 4.3 (MODERATE) with vector string CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N.
What CWE is associated with GHSA-ccgq-fx7h-2v4c?
GHSA-ccgq-fx7h-2v4c is classified under CWE-639: Authorization Bypass Through User-Controlled Key (The system's authorization functionality does not prevent one user from gaining access to another user's data or record by modifying the key value identifying the data.).
How can I check Go dependencies for GHSA-ccgq-fx7h-2v4c?
Run the dependency tree command: 'inspect dependencies for code.vikunja.io/api'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-ccgq-fx7h-2v4c",
  "modified" : "2026-10-09T20:51:34Z",
  "published" : "2026-09-15T18:32:30Z",
  "withdrawn" : "2026-10-09T20:51:33Z",
  "aliases" : [ ],
  "summary" : "Duplicate Advisory: Vikunja: Cross-tenant task-position rows can be injected into arbitrary project views via the unvalidated project_view_id in the task position endpoint (v1 and v2)",
  "details" : "### Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-w39f-h553-h2mx. This link is maintained to preserve external references.\n\n### Original Description\nVikunja before 2.6.0 fails to validate that user-supplied project_view_id in task-position requests belongs to the task's project. Authenticated attackers can insert task position rows into arbitrary other tenant project views via POST or PUT task-position endpoints.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N"
  }, {
    "type" : "CVSS_V4",
    "score" : "CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/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"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "code.vikunja.io/api"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "2.5.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-w39f-h553-h2mx"
  }, {
    "type" : "ADVISORY",
    "url" : "https://nvd.nist.gov/vuln/detail/CVE-2026-91984"
  }, {
    "type" : "WEB",
    "url" : "https://www.vulncheck.com/advisories/vikunja-before-2.6.0-broken-object-level-authorization-via-task-position"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-639" ],
    "severity" : "MODERATE",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-10-09T20:51:33Z",
    "nvd_published_at" : "2026-09-15T16:17:55Z"
  }
}