GHSA-9jrx-vmh8-c6xw: Duplicate Advisory Vikunja: Link-share Principal ID Collision Vulnerability
HIGHGHSA-9jrx-vmh8-c6xw is a HIGH (CVSS 8.1) vikunja: link-share principal id collision vulnerability (CWE-863: Incorrect Authorization) affecting Duplicate Advisory libraries in the Go ecosystem. The issue involves vikunja: link-share principal id collision allows cross-account api token issuance and management. Remediation is available in the latest vendor maintenance releases.
GHSA-9jrx-vmh8-c6xw at a Glance
Security Impact
CVSS: 8.1
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:H/I:H/A:N).
How to Fix GHSA-9jrx-vmh8-c6xw
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.
Upgrade code.vikunja.io/api to Latest secure releaseRun the following command in your project directory to verify that all resolved dependencies use the patched release:
inspect dependencies for code.vikunja.io/apiHow to Check if You Are Affected
To determine whether your application is affected by GHSA-9jrx-vmh8-c6xw, inspect your project dependencies for Duplicate Advisory:
inspect dependencies for code.vikunja.io/apiAnalyze 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-863: Incorrect Authorization, where the product performs an authorization check when an actor attempts to access a resource or perform an action, but it does not correctly perform the check. 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
GHSA-9jrx-vmh8-c6xw Affected Duplicate Advisory Versions
1 component(s)| Product / Package | Ecosystem | Affected Versions | Fixed Version |
|---|---|---|---|
|
code.vikunja.io/api
|
Go |
≥ 0.22.0
≤ 2.3.0
|
|
References
Frequently Asked Questions
What is GHSA-9jrx-vmh8-c6xw?
Which Duplicate Advisory versions are affected?
What version fixes GHSA-9jrx-vmh8-c6xw?
Is code.vikunja.io/api affected?
What is the CVSS score of GHSA-9jrx-vmh8-c6xw?
What CWE is associated with GHSA-9jrx-vmh8-c6xw?
How can I check Go dependencies for GHSA-9jrx-vmh8-c6xw?
Machine-readable OSV JSON
OSV v1.5 Schema
{
"schema_version" : "1.4.0",
"id" : "GHSA-9jrx-vmh8-c6xw",
"modified" : "2026-10-09T20:42:06Z",
"published" : "2026-08-02T15:30:21Z",
"withdrawn" : "2026-10-09T20:42:06Z",
"aliases" : [ ],
"summary" : "Duplicate Advisory: Vikunja: Link-share principal ID collision allows cross-account API token issuance and management",
"details" : "### Duplicate Advisory\nThis advisory has been withdrawn because it is a duplicate of GHSA-vvcv-vpph-h844. This link is maintained to preserve external references.\n\n### Original Description\nVikunja 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" : [ {
"type" : "CVSS_V3",
"score" : "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N"
}, {
"type" : "CVSS_V4",
"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"
} ],
"affected" : [ {
"package" : {
"ecosystem" : "Go",
"name" : "code.vikunja.io/api"
},
"ranges" : [ {
"type" : "ECOSYSTEM",
"events" : [ {
"introduced" : "0.22.0"
}, {
"last_affected" : "2.3.0"
} ]
} ]
} ],
"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"
} ],
"database_specific" : {
"cwe_ids" : [ "CWE-863" ],
"severity" : "HIGH",
"github_reviewed" : true,
"github_reviewed_at" : "2026-10-09T20:42:06Z",
"nvd_published_at" : "2026-08-02T13:16:54Z"
}
}