{"id":"CVE-2026-1046","state":"PUBLISHED","title":"Arbitrary application execution via unvalidated server-controlled URLs in Help menu","description":"Mattermost Desktop App versions <=6.0 6.2.0 5.2.13.0 fail to validate help links which allows a malicious Mattermost server to execute arbitrary executables on a user’s system via the user clicking on certain items in the Help menu Mattermost Advisory ID: MMSA-2026-00577","publishedAt":"2026-02-16T12:10:38.668Z","updatedAt":"2026-02-17T17:05:58.569Z","severity":{"score":7.6,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:L","source":"Mattermost"},"assigner":"Mattermost","products":["Mattermost Mattermost"],"affected":[{"vendor":"Mattermost","product":"Mattermost","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"6.2.0","versionType":"semver"},{"version":"0","status":"affected","lessThanOrEqual":"5.2.13","versionType":"semver"},{"version":"6.1.0","status":"unaffected"},{"version":"6.0.3.0","status":"unaffected"},{"version":"5.13.3.0","status":"unaffected"}]}],"references":["https://mattermost.com/security-updates"],"weaknesses":["CWE-939"],"ingestedAt":"2026-10-29T20:11:10.572Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/1xxx/CVE-2026-1046.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-1046","state":"PUBLISHED","datePublished":"2026-02-16T12:10:38.668Z","dateUpdated":"2026-02-17T17:05:58.569Z","assignerShortName":"Mattermost","assignerOrgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","dateReserved":"2026-01-16T16:24:48.693Z"},"containers":{"cna":{"title":"Arbitrary application execution via unvalidated server-controlled URLs in Help menu","descriptions":[{"lang":"en","value":"Mattermost Desktop App versions <=6.0 6.2.0 5.2.13.0 fail to validate help links which allows a malicious Mattermost server to execute arbitrary executables on a user’s system via the user clicking on certain items in the Help menu Mattermost Advisory ID: MMSA-2026-00577"}],"affected":[{"vendor":"Mattermost","product":"Mattermost","defaultStatus":"unaffected","versions":[{"version":"0","status":"affected","lessThanOrEqual":"6.2.0","versionType":"semver"},{"version":"0","status":"affected","lessThanOrEqual":"5.2.13","versionType":"semver"},{"version":"6.1.0","status":"unaffected"},{"version":"6.0.3.0","status":"unaffected"},{"version":"5.13.3.0","status":"unaffected"}]}],"references":[{"url":"https://mattermost.com/security-updates","name":"MMSA-2026-00577","tags":["vendor-advisory"]}],"metrics":[{"cvssV3_1":{"attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"REQUIRED","scope":"CHANGED","confidentialityImpact":"HIGH","integrityImpact":"NONE","availabilityImpact":"LOW","version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:N/A:L","baseSeverity":"HIGH","baseScore":7.6},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-939","lang":"en","type":"CWE","description":"CWE-939: Improper Authorization in Handler for Custom URL Scheme"}]}],"providerMetadata":{"shortName":"Mattermost","orgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","dateUpdated":"2026-02-16T12:10:38.668Z"},"credits":[{"lang":"en","type":"finder","value":"hackerman70000"}],"solutions":[{"value":"Update Mattermost Desktop App to versions 6.1.0, 6.0.3.0, 5.13.3.0 or higher.","lang":"en"}],"source":{"advisory":"MMSA-2026-00577","defect":["https://mattermost.atlassian.net/browse/MM-67103"],"discovery":"EXTERNAL"},"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-02-17T16:42:12.292444Z","id":"CVE-2026-1046","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-02-17T17:05:58.569Z"}}]}}}