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        "assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
        "state": "PUBLISHED",
        "assignerShortName": "Mattermost",
        "dateReserved": "2026-04-17T14:25:10.246Z",
        "datePublished": "2026-06-15T13:55:25.742Z",
        "dateUpdated": "2026-06-15T16:00:00.919Z"
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    "containers": {
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            "affected": [
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                    "defaultStatus": "unaffected",
                    "product": "Mattermost",
                    "vendor": "Mattermost",
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                            "lessThanOrEqual": "5.5.13",
                            "status": "affected",
                            "version": "0",
                            "versionType": "semver"
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                            "version": "6.2.0",
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                            "version": "5.13.6.0",
                            "status": "unaffected"
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            "credits": [
                {
                    "lang": "en",
                    "type": "finder",
                    "value": "falke"
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            ],
            "descriptions": [
                {
                    "lang": "en",
                    "value": "Mattermost Desktop App versions <=6.1 5.5.13.0 fail to restrict the allow list of domains to which NTLM credentials were forwarded to in the Mattermost Desktop App which allows any user on a server without the image proxy enabled to intercept other users credentials via embedding an image that routes to an external web server. Mattermost Advisory ID: MMSA-2026-00651"
                }
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                {
                    "cvssV3_1": {
                        "attackVector": "NETWORK",
                        "attackComplexity": "HIGH",
                        "privilegesRequired": "LOW",
                        "userInteraction": "NONE",
                        "scope": "CHANGED",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "NONE",
                        "availabilityImpact": "NONE",
                        "version": "3.1",
                        "vectorString": "CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:C/C:H/I:N/A:N",
                        "baseSeverity": "MEDIUM",
                        "baseScore": 6.3
                    },
                    "format": "CVSS",
                    "scenarios": [
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                            "lang": "en",
                            "value": "GENERAL"
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            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "lang": "en",
                            "type": "CWE",
                            "description": "CWE-522: Insufficiently Protected Credentials",
                            "cweId": "CWE-522"
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            "references": [
                {
                    "url": "https://mattermost.com/security-updates",
                    "name": "MMSA-2026-00651",
                    "tags": [
                        "vendor-advisory"
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            ],
            "solutions": [
                {
                    "value": "Update Mattermost Desktop App to versions 6.2.0, 5.13.6.0 or higher.",
                    "lang": "en"
                }
            ],
            "source": {
                "advisory": "MMSA-2026-00651",
                "defect": [
                    "https://mattermost.atlassian.net/browse/MM-68362"
                ],
                "discovery": "EXTERNAL"
            },
            "title": "Mattermost Desktop App fails to restrict the allow list of domains which NTLM credentials are passed",
            "providerMetadata": {
                "orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee",
                "shortName": "Mattermost",
                "dateUpdated": "2026-06-15T13:55:25.742Z"
            },
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        "adp": [
            {
                "metrics": [
                    {
                        "other": {
                            "type": "ssvc",
                            "content": {
                                "timestamp": "2026-06-15T15:59:27.291763Z",
                                "id": "CVE-2026-6517",
                                "options": [
                                    {
                                        "Exploitation": "none"
                                    },
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                                        "Automatable": "no"
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                                        "Technical Impact": "partial"
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                                "role": "CISA Coordinator",
                                "version": "2.0.3"
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                "title": "CISA ADP Vulnrichment",
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