{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-5308", "assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "state": "PUBLISHED", "assignerShortName": "Mattermost", "dateReserved": "2026-04-01T10:35:26.431Z", "datePublished": "2026-05-22T10:20:43.629Z", "dateUpdated": "2026-05-22T12:14:58.221Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "Mattermost", "vendor": "Mattermost", "versions": [{"lessThanOrEqual": "11.6.0", "status": "affected", "version": "11.6.0", "versionType": "semver"}, {"lessThanOrEqual": "11.5.3", "status": "affected", "version": "11.5.0", "versionType": "semver"}, {"lessThanOrEqual": "11.4.4", "status": "affected", "version": "11.4.0", "versionType": "semver"}, {"lessThanOrEqual": "10.11.14", "status": "affected", "version": "10.11.0", "versionType": "semver"}, {"version": "11.7.0", "status": "unaffected"}, {"version": "11.6.1", "status": "unaffected"}, {"version": "11.5.4", "status": "unaffected"}, {"version": "11.4.5", "status": "unaffected"}, {"version": "10.11.15", "status": "unaffected"}]}], "credits": [{"lang": "en", "type": "finder", "value": "thecybertantrik"}], "descriptions": [{"lang": "en", "value": "Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to enforce request body size limits on plugin HTTP endpoints which allows an attacker to cause a denial of service via crafted oversized HTTP requests.. Mattermost Advisory ID: MMSA-2026-00646"}], "metrics": [{"cvssV3_1": {"attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "HIGH", "userInteraction": "NONE", "scope": "UNCHANGED", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "availabilityImpact": "HIGH", "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H", "baseSeverity": "MEDIUM", "baseScore": 4.9}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "description": "CWE-400 Uncontrolled Resource Consumption", "cweId": "CWE-400"}]}], "references": [{"url": "https://mattermost.com/security-updates", "name": "MMSA-2026-00646", "tags": ["vendor-advisory"]}], "solutions": [{"value": "Update Mattermost to versions 11.7.0, 11.6.1, 11.5.4, 11.4.5, 10.11.15 or higher.", "lang": "en"}], "source": {"advisory": "MMSA-2026-00646", "defect": ["https://mattermost.atlassian.net/browse/MM-68163"], "discovery": "EXTERNAL"}, "title": "Missing request body size limits on Zoom plugin HTTP endpoints", "providerMetadata": {"orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "shortName": "Mattermost", "dateUpdated": "2026-05-22T10:20:43.629Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-05-22T12:14:52.101944Z", "id": "CVE-2026-5308", "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": "2026-05-22T12:14:58.221Z"}}]}}