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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-55064",
"assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"state": "PUBLISHED",
"assignerShortName": "GitHub_M",
"dateReserved": "2026-06-16T14:33:35.710Z",
"datePublished": "2026-08-28T16:38:38.293Z",
"dateUpdated": "2026-08-28T20:29:30.143Z"
},
"containers": {
"cna": {
"title": "Vikunja incomplete fix for CVE-2026-35595: Write-only user can detach shared project from parent hierarchy via parent_project_id=0",
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-862",
"lang": "en",
"description": "CWE-862: Missing Authorization",
"type": "CWE"
}
]
}
],
"metrics": [
{
"cvssV3_1": {
"attackComplexity": "LOW",
"attackVector": "NETWORK",
"availabilityImpact": "NONE",
"baseScore": 4.3,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "LOW",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N",
"version": "3.1"
}
}
],
"references": [
{
"name": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-44v6-7fxq-vgf4",
"tags": [
"x_refsource_CONFIRM"
],
"url": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-44v6-7fxq-vgf4"
},
{
"name": "https://github.com/go-vikunja/vikunja/pull/3239",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/go-vikunja/vikunja/pull/3239"
},
{
"name": "https://github.com/go-vikunja/vikunja/commit/781ffac198548ae4f3d1febc613caed8e0e11d01",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/go-vikunja/vikunja/commit/781ffac198548ae4f3d1febc613caed8e0e11d01"
},
{
"name": "https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0",
"tags": [
"x_refsource_MISC"
],
"url": "https://github.com/go-vikunja/vikunja/releases/tag/v2.4.0"
}
],
"affected": [
{
"vendor": "go-vikunja",
"product": "vikunja",
"versions": [
{
"version": ">= 2.3.0, < 2.4.0",
"status": "affected"
}
]
}
],
"providerMetadata": {
"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
"shortName": "GitHub_M",
"dateUpdated": "2026-08-28T16:38:38.293Z"
},
"descriptions": [
{
"lang": "en",
"value": "Vikunja is an open-source self-hosted task management platform. From 2.3.0 until 2.4.0, a user with Write but not Admin permission on a shared child project can detach it from its parent hierarchy by submitting parent_project_id equal to 0 to POST /api/v1/projects/{project}. The Project.CanUpdate authorization check in pkg/models/project_permissions.go and UpdateProject logic in pkg/models/project.go only gate nonzero parent values, while UpdateProject always persists parent_project_id, so the explicit zero value bypasses the Admin requirement introduced for CVE-2026-35595. Detachment severs the recursive permission-inheritance chain and can disrupt the owner’s hierarchy and inherited collaborator access. This issue is fixed in version 2.4.0."
}
],
"source": {
"advisory": "GHSA-44v6-7fxq-vgf4",
"discovery": "UNKNOWN"
}
},
"adp": [
{
"references": [
{
"url": "https://github.com/go-vikunja/vikunja/security/advisories/GHSA-44v6-7fxq-vgf4",
"tags": [
"exploit"
]
}
],
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-08-28T20:29:08.984552Z",
"id": "CVE-2026-55064",
"options": [
{
"Exploitation": "poc"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-08-28T20:29:30.143Z"
}
}
]
}
}