{"id":"CVE-2026-13426","state":"PUBLISHED","title":"Client4 fails to validate path parameters","description":"The Mattermost Go module github.com/mattermost/mattermost/server/public versions < v0.1.22 fail to validate path parameters when constructing API route paths which allows an attacker to redirect API calls to unintended endpoints via crafted IDs containing path traversal components. Mattermost Advisory ID: MMSA-2025-00532","publishedAt":"2026-06-26T13:47:10.090Z","updatedAt":"2026-06-26T14:39:00.126Z","severity":{"score":5.4,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","source":"Mattermost"},"assigner":"Mattermost","products":["Mattermost github.com/mattermost/mattermost/server/public"],"affected":[{"vendor":"Mattermost","product":"github.com/mattermost/mattermost/server/public","defaultStatus":"unaffected","versions":[{"version":"v0.0.0","status":"affected","lessThan":"v0.1.22","versionType":"semver"},{"version":"v0.1.22","status":"unaffected"}]}],"references":["https://mattermost.com/security-updates"],"weaknesses":["CWE-22"],"ingestedAt":"2026-10-29T20:11:00.674Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/13xxx/CVE-2026-13426.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-13426","state":"PUBLISHED","datePublished":"2026-06-26T13:47:10.090Z","dateUpdated":"2026-06-26T14:39:00.126Z","assignerShortName":"Mattermost","assignerOrgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","dateReserved":"2026-06-26T13:32:10.276Z"},"containers":{"cna":{"title":"Client4 fails to validate path parameters","descriptions":[{"lang":"en","value":"The Mattermost Go module github.com/mattermost/mattermost/server/public versions < v0.1.22 fail to validate path parameters when constructing API route paths which allows an attacker to redirect API calls to unintended endpoints via crafted IDs containing path traversal components. Mattermost Advisory ID: MMSA-2025-00532"}],"affected":[{"vendor":"Mattermost","product":"github.com/mattermost/mattermost/server/public","defaultStatus":"unaffected","versions":[{"version":"v0.0.0","status":"affected","lessThan":"v0.1.22","versionType":"semver"},{"version":"v0.1.22","status":"unaffected"}]}],"references":[{"url":"https://mattermost.com/security-updates","name":"MMSA-2025-00532","tags":["vendor-advisory"]}],"metrics":[{"cvssV3_1":{"attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"LOW","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"LOW","availabilityImpact":"NONE","version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N","baseSeverity":"MEDIUM","baseScore":5.4},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-22","lang":"en","type":"CWE","description":"CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')"}]}],"providerMetadata":{"shortName":"Mattermost","orgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","dateUpdated":"2026-06-26T13:47:10.090Z"},"credits":[{"lang":"en","type":"finder","value":"Juho Forsén"}],"solutions":[{"value":"Update the github.com/mattermost/mattermost/server/public module to v0.1.22 or higher.","lang":"en"}],"source":{"advisory":"MMSA-2025-00532","defect":["https://mattermost.atlassian.net/browse/MM-65969"],"discovery":"{\"self\"=>\"https://mattermost.atlassian.net/rest/api/2/customFieldOption/10557\", \"value\"=>\"Internal\", \"id\"=>\"10557\"}"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-06-26T14:38:53.805003Z","id":"CVE-2026-13426","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":"2026-06-26T14:39:00.126Z"}}]}}}