{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-1628","assignerOrgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","state":"PUBLISHED","assignerShortName":"Mattermost","dateReserved":"2026-01-29T15:14:51.993Z","datePublished":"2026-03-02T13:24:21.391Z","dateUpdated":"2026-03-02T14:58:30.546Z"},"containers":{"cna":{"affected":[{"defaultStatus":"unaffected","product":"Mattermost","vendor":"Mattermost","versions":[{"lessThanOrEqual":"5.13.3","status":"affected","version":"0","versionType":"semver"},{"version":"5.13.4.0","status":"unaffected"}]}],"credits":[{"lang":"en","type":"finder","value":"N/A"}],"descriptions":[{"lang":"en","value":"Mattermost Desktop App versions <=5.13.3 fail to attach listeners restricting navigation to external sites within the Mattermost app which allows a malicious server to expose preload script functionality to untrusted servers via having a user open an external link in their Mattermost server. Mattermost Advisory ID: MMSA-2026-00596"}],"metrics":[{"cvssV3_1":{"attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"REQUIRED","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE","version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N","baseSeverity":"MEDIUM","baseScore":4.6},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"lang":"en","type":"CWE","description":"CWE-829: Inclusion of Functionality from Untrusted Control Sphere","cweId":"CWE-829"}]}],"references":[{"url":"https://mattermost.com/security-updates","name":"MMSA-2026-00596","tags":["vendor-advisory"]}],"solutions":[{"value":"Update Mattermost Desktop App to versions 5.13.4.0 or higher.","lang":"en"}],"source":{"advisory":"MMSA-2026-00596","defect":["https://mattermost.atlassian.net/browse/MM-67374"],"discovery":"EXTERNAL"},"title":"Mattermost allows external websites to open within the app, exposing preload functionality to non-trusted sites.","providerMetadata":{"orgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","shortName":"Mattermost","dateUpdated":"2026-03-02T13:24:21.391Z"}},"adp":[{"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-03-02T14:57:20.504558Z","id":"CVE-2026-1628","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":"2026-03-02T14:58:30.546Z"}}]}}