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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-9597",
"assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
"state": "PUBLISHED",
"assignerShortName": "Mattermost",
"dateReserved": "2026-05-26T15:15:14.343Z",
"datePublished": "2026-07-13T08:17:36.717Z",
"dateUpdated": "2026-07-13T13:55:15.448Z"
},
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Mattermost",
"vendor": "Mattermost",
"versions": [
{
"lessThanOrEqual": "11.7.2",
"status": "affected",
"version": "11.7.0",
"versionType": "semver"
},
{
"lessThanOrEqual": "11.6.4",
"status": "affected",
"version": "11.6.0",
"versionType": "semver"
},
{
"version": "11.8.0",
"status": "unaffected"
},
{
"version": "11.7.3",
"status": "unaffected"
},
{
"version": "11.6.5",
"status": "unaffected"
}
]
}
],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "alimursaliyev"
}
],
"descriptions": [
{
"lang": "en",
"value": "Mattermost versions 11.7.x <= 11.7.2, 11.6.x <= 11.6.4 fail to verify whether a guest account is deactivated before creating a session in the magic-link token login path, which allows a deactivated guest user to obtain a fully functional session via a magic-link token issued prior to deactivation.. Mattermost Advisory ID: MMSA-2026-00681"
}
],
"metrics": [
{
"cvssV3_1": {
"attackVector": "NETWORK",
"attackComplexity": "LOW",
"privilegesRequired": "LOW",
"userInteraction": "NONE",
"scope": "UNCHANGED",
"confidentialityImpact": "LOW",
"integrityImpact": "LOW",
"availabilityImpact": "NONE",
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N",
"baseSeverity": "MEDIUM",
"baseScore": 5.4
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"lang": "en",
"type": "CWE",
"description": "CWE-305 – Authentication Bypass by Primary Weakness",
"cweId": "CWE-305"
}
]
}
],
"references": [
{
"url": "https://mattermost.com/security-updates",
"name": "MMSA-2026-00681",
"tags": [
"vendor-advisory"
]
}
],
"solutions": [
{
"value": "Update Mattermost to versions 11.8.0, 11.7.3, 11.6.5 or higher.",
"lang": "en"
}
],
"source": {
"advisory": "MMSA-2026-00681",
"defect": [
"https://mattermost.atlassian.net/browse/MM-68994"
],
"discovery": "EXTERNAL"
},
"title": "Deactivated guest accounts can authenticate via magic-link token in Mattermost REST API login endpoint",
"providerMetadata": {
"orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
"shortName": "Mattermost",
"dateUpdated": "2026-07-13T08:17:36.717Z"
},
"x_generator": {
"engine": "cvelib 1.8.0"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"timestamp": "2026-07-13T13:55:09.692643Z",
"id": "CVE-2026-9597",
"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": "2026-07-13T13:55:15.448Z"
}
}
]
}
}