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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-1046",
"assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
"state": "PUBLISHED",
"assignerShortName": "Mattermost",
"dateReserved": "2026-01-16T16:24:48.693Z",
"datePublished": "2026-02-16T12:10:38.668Z",
"dateUpdated": "2026-02-17T17:05:58.569Z"
},
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Mattermost",
"vendor": "Mattermost",
"versions": [
{
"lessThanOrEqual": "6.2.0",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.2.13",
"status": "affected",
"version": "0",
"versionType": "semver"
},
{
"version": "6.1.0",
"status": "unaffected"
},
{
"version": "6.0.3.0",
"status": "unaffected"
},
{
"version": "5.13.3.0",
"status": "unaffected"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "hackerman70000"
}
],
"descriptions": [
{
"lang": "en",
"value": "Mattermost Desktop App versions <=6.0 6.2.0 5.2.13.0 fail to validate help links which allows a malicious Mattermost server to execute arbitrary executables on a user’s system via the user clicking on certain items in the Help menu Mattermost Advisory ID: MMSA-2026-00577"
}
],
"metrics": [
{
"cvssV3_1": {
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "REQUIRED",
"scope": "CHANGED",
"confidentialityImpact": "HIGH",
"integrityImpact": "NONE",
"availabilityImpact": "LOW",
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:L",
"baseSeverity": "HIGH",
"baseScore": 7.6
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"lang": "en",
"type": "CWE",
"description": "CWE-939: Improper Authorization in Handler for Custom URL Scheme",
"cweId": "CWE-939"
}
]
}
],
"references": [
{
"url": "https://mattermost.com/security-updates",
"name": "MMSA-2026-00577",
"tags": [
"vendor-advisory"
]
}
],
"solutions": [
{
"value": "Update Mattermost Desktop App to versions 6.1.0, 6.0.3.0, 5.13.3.0 or higher.",
"lang": "en"
}
],
"source": {
"advisory": "MMSA-2026-00577",
"defect": [
"https://mattermost.atlassian.net/browse/MM-67103"
],
"discovery": "EXTERNAL"
},
"title": "Arbitrary application execution via unvalidated server-controlled URLs in Help menu",
"providerMetadata": {
"orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
"shortName": "Mattermost",
"dateUpdated": "2026-02-16T12:10:38.668Z"
},
"x_generator": {
"engine": "cvelib 1.8.0"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-02-17T16:42:12.292444Z",
"id": "CVE-2026-1046",
"options": [
{
"Exploitation": "none"
},
{
"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": "2026-02-17T17:05:58.569Z"
}
}
]
}
}