{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-3472", "assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "state": "PUBLISHED", "assignerShortName": "Mattermost", "dateReserved": "2026-03-03T11:25:53.785Z", "datePublished": "2026-06-26T14:42:24.154Z", "dateUpdated": "2026-06-26T15:41:09.780Z"}, "containers": {"cna": {"affected": [{"defaultStatus": "unaffected", "product": "Mattermost", "vendor": "Mattermost", "versions": [{"lessThanOrEqual": "10.11.18", "status": "affected", "version": "10.11.0", "versionType": "semver"}, {"lessThanOrEqual": "11.6.3", "status": "affected", "version": "11.6.0", "versionType": "semver"}, {"lessThanOrEqual": "11.5.6", "status": "affected", "version": "11.5.0", "versionType": "semver"}, {"version": "11.7.0", "status": "unaffected"}, {"version": "10.11.19", "status": "unaffected"}, {"version": "11.6.4", "status": "unaffected"}, {"version": "11.5.7", "status": "unaffected"}]}], "credits": [{"lang": "en", "type": "finder", "value": "Juho Fors\u00e9n"}], "descriptions": [{"lang": "en", "value": "Mattermost versions 10.11.x <= 10.11.18, 11.6.x <= 11.6.3, 11.5.x <= 11.5.6 fail to properly apply markdown image rendering restrictions to AI bot tool result posts, which allows an authenticated attacker to exfiltrate data to an attacker-controlled server via injecting markdown image syntax into tool result content rendered by a victim's client.. Mattermost Advisory ID: MMSA-2026-00619"}], "metrics": [{"cvssV3_1": {"attackVector": "NETWORK", "attackComplexity": "LOW", "privilegesRequired": "LOW", "userInteraction": "REQUIRED", "scope": "UNCHANGED", "confidentialityImpact": "LOW", "integrityImpact": "NONE", "availabilityImpact": "NONE", "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N", "baseSeverity": "LOW", "baseScore": 3.5}, "format": "CVSS", "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "description": "CWE-693: Protection Mechanism Failure", "cweId": "CWE-693"}]}], "references": [{"url": "https://mattermost.com/security-updates", "name": "MMSA-2026-00619", "tags": ["vendor-advisory"]}], "solutions": [{"value": "Update Mattermost to versions 11.7.0, 10.11.19, 11.6.4, 11.5.7 or higher.", "lang": "en"}], "source": {"advisory": "MMSA-2026-00619", "defect": ["https://mattermost.atlassian.net/browse/MM-67751"], "discovery": "{\"self\"=>\"https://mattermost.atlassian.net/rest/api/2/customFieldOption/10557\", \"value\"=>\"Internal\", \"id\"=>\"10557\"}"}, "title": "Markdown image rendering bypass in AI bot tool result posts in Mattermost", "providerMetadata": {"orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "shortName": "Mattermost", "dateUpdated": "2026-06-26T14:42:24.154Z"}, "x_generator": {"engine": "cvelib 1.8.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"timestamp": "2026-06-26T15:41:02.864491Z", "id": "CVE-2026-3472", "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": "2026-06-26T15:41:09.780Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-3472", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "no"}, {"Technical Impact": "partial"}], "version": "2.0.3", "timestamp": "2026-06-26T15:41:02.864491Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-06-26T15:41:06.401Z"}}], "cna": {"title": "Markdown image rendering bypass in AI bot tool result posts in Mattermost", "source": {"defect": ["https://mattermost.atlassian.net/browse/MM-67751"], "advisory": "MMSA-2026-00619", "discovery": "{\"self\"=>\"https://mattermost.atlassian.net/rest/api/2/customFieldOption/10557\", \"value\"=>\"Internal\", \"id\"=>\"10557\"}"}, "credits": [{"lang": "en", "type": "finder", "value": "Juho Fors\u00e9n"}], "metrics": [{"format": "CVSS", "cvssV3_1": {"scope": "UNCHANGED", "version": "3.1", "baseScore": 3.5, "attackVector": "NETWORK", "baseSeverity": "LOW", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N", "integrityImpact": "NONE", "userInteraction": "REQUIRED", "attackComplexity": "LOW", "availabilityImpact": "NONE", "privilegesRequired": "LOW", "confidentialityImpact": "LOW"}, "scenarios": [{"lang": "en", "value": "GENERAL"}]}], "affected": [{"vendor": "Mattermost", "product": "Mattermost", "versions": [{"status": "affected", "version": "10.11.0", "versionType": "semver", "lessThanOrEqual": "10.11.18"}, {"status": "affected", "version": "11.6.0", "versionType": "semver", "lessThanOrEqual": "11.6.3"}, {"status": "affected", "version": "11.5.0", "versionType": "semver", "lessThanOrEqual": "11.5.6"}, {"status": "unaffected", "version": "11.7.0"}, {"status": "unaffected", "version": "10.11.19"}, {"status": "unaffected", "version": "11.6.4"}, {"status": "unaffected", "version": "11.5.7"}], "defaultStatus": "unaffected"}], "solutions": [{"lang": "en", "value": "Update Mattermost to versions 11.7.0, 10.11.19, 11.6.4, 11.5.7 or higher."}], "references": [{"url": "https://mattermost.com/security-updates", "name": "MMSA-2026-00619", "tags": ["vendor-advisory"]}], "x_generator": {"engine": "cvelib 1.8.0"}, "descriptions": [{"lang": "en", "value": "Mattermost versions 10.11.x <= 10.11.18, 11.6.x <= 11.6.3, 11.5.x <= 11.5.6 fail to properly apply markdown image rendering restrictions to AI bot tool result posts, which allows an authenticated attacker to exfiltrate data to an attacker-controlled server via injecting markdown image syntax into tool result content rendered by a victim's client.. Mattermost Advisory ID: MMSA-2026-00619"}], "problemTypes": [{"descriptions": [{"lang": "en", "type": "CWE", "cweId": "CWE-693", "description": "CWE-693: Protection Mechanism Failure"}]}], "providerMetadata": {"orgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "shortName": "Mattermost", "dateUpdated": "2026-06-26T14:42:24.154Z"}}}, "cveMetadata": {"cveId": "CVE-2026-3472", "state": "PUBLISHED", "dateUpdated": "2026-06-26T15:41:09.780Z", "dateReserved": "2026-03-03T11:25:53.785Z", "assignerOrgId": "9302f53e-dde5-4bf3-b2f2-a83f91ac0eee", "datePublished": "2026-06-26T14:42:24.154Z", "assignerShortName": "Mattermost"}, "dataVersion": "5.2"}

{}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[10.11.0,10.11.18]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[11.6.0,11.6.3]"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[11.5.0,11.5.6]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "11.7.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "10.11.19"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "11.6.4"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "11.5.7"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "Mattermost", "source": "cna", "vendor": "Mattermost"}, "product": "mattermost", "vendor": "mattermost"}], "created": "2026-06-26T16:30:03.422276+00:00", "updated": "2026-06-26T19:00:04.691603+00:00", "vendors": ["mattermost", "mattermost$PRODUCT$mattermost"]}