{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-4643","assignerOrgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","state":"PUBLISHED","assignerShortName":"Mattermost","dateReserved":"2026-03-23T11:42:45.791Z","datePublished":"2026-05-18T08:43:34.588Z","dateUpdated":"2026-05-18T14:36:01.271Z"},"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Mattermost","vendor":"Mattermost","versions":[{"lessThanOrEqual":"6.0.1","status":"affected","version":"0","versionType":"semver"},{"lessThanOrEqual":"5.4.13","status":"affected","version":"0","versionType":"semver"},{"version":"6.2.0","status":"unaffected"},{"version":"6.1.1.0","status":"unaffected"},{"version":"5.13.5.0","status":"unaffected"}]}],"credits":[{"lang":"en","type":"finder","value":"Devin Binnie"}],"descriptions":[{"lang":"en","value":"Mattermost Desktop App versions <=6.1 6.0.1 5.4.13.0 fail to prevent server-rendered content from closing an underlying application view in the Mattermost Desktop App which allows a malicious server or plugin to crash the desktop client via invoking {{window.close()}} in the renderer context, leading to a denial of service condition at the client level. Mattermost Advisory ID: MMSA-2026-00633"}],"metrics":[{"cvssV3_1":{"attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"NONE","integrityImpact":"NONE","availabilityImpact":"LOW","version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L","baseSeverity":"LOW","baseScore":3.5},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"lang":"en","type":"CWE","description":"CWE-754: Improper Check for Unusual or Exceptional Conditions","cweId":"CWE-754"}]}],"references":[{"url":"https://mattermost.com/security-updates","name":"MMSA-2026-00633","tags":["vendor-advisory"]}],"solutions":[{"value":"Update Mattermost Desktop App to versions 6.2.0, 6.1.1.0, 5.13.5.0 or higher.","lang":"en"}],"source":{"advisory":"MMSA-2026-00633","defect":["https://mattermost.atlassian.net/browse/MM-67910"],"discovery":"{\"self\"=>\"https://mattermost.atlassian.net/rest/api/2/customFieldOption/10557\", \"value\"=>\"Internal\", \"id\"=>\"10557\"}"},"title":"Calling window.close() from server-side content causes crash in the Mattermost Desktop App","providerMetadata":{"orgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","shortName":"Mattermost","dateUpdated":"2026-05-18T08:43:34.588Z"},"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-05-18T14:35:39.361607Z","id":"CVE-2026-4643","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":"2026-05-18T14:36:01.271Z"}}]}}