{"id":"CVE-2026-93848","state":"PUBLISHED","title":"Mattermost OpenID discovery endpoint request bypasses outbound connection filtering, allowing SSRF by a System Administrator","description":"Mattermost versions 11.7.x <= 11.7.10 fail to apply outbound internal-connection filtering to the OpenID discovery endpoint request which allows a System Administrator to determine whether internal addresses and ports are reachable from the server via an unauthenticated login request that triggers the discovery fetch.. Mattermost Advisory ID: MMSA-2026-00774","publishedAt":"2026-10-26T14:28:23.565Z","updatedAt":"2026-10-26T16:46:45.446Z","severity":{"score":2.7,"label":"Low","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N","source":"Mattermost"},"assigner":"Mattermost","products":["Mattermost Mattermost"],"affected":[{"vendor":"Mattermost","product":"Mattermost","defaultStatus":"unaffected","versions":[{"version":"11.7.0","status":"affected","lessThanOrEqual":"11.7.10","versionType":"semver"},{"version":"11.11.0","status":"unaffected"},{"version":"11.7.11","status":"unaffected"}]}],"references":["https://mattermost.com/security-updates"],"weaknesses":["CWE-918"],"ingestedAt":"2026-10-29T20:13:34.582Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/93xxx/CVE-2026-93848.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-93848","state":"PUBLISHED","datePublished":"2026-10-26T14:28:23.565Z","dateUpdated":"2026-10-26T16:46:45.446Z","assignerShortName":"Mattermost","assignerOrgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","dateReserved":"2026-09-18T18:39:08.557Z"},"containers":{"cna":{"title":"Mattermost OpenID discovery endpoint request bypasses outbound connection filtering, allowing SSRF by a System Administrator","descriptions":[{"lang":"en","value":"Mattermost versions 11.7.x <= 11.7.10 fail to apply outbound internal-connection filtering to the OpenID discovery endpoint request which allows a System Administrator to determine whether internal addresses and ports are reachable from the server via an unauthenticated login request that triggers the discovery fetch.. Mattermost Advisory ID: MMSA-2026-00774"}],"affected":[{"vendor":"Mattermost","product":"Mattermost","defaultStatus":"unaffected","versions":[{"version":"11.7.0","status":"affected","lessThanOrEqual":"11.7.10","versionType":"semver"},{"version":"11.11.0","status":"unaffected"},{"version":"11.7.11","status":"unaffected"}]}],"references":[{"url":"https://mattermost.com/security-updates","name":"MMSA-2026-00774","tags":["vendor-advisory"]}],"metrics":[{"cvssV3_1":{"attackVector":"NETWORK","attackComplexity":"LOW","privilegesRequired":"HIGH","userInteraction":"NONE","scope":"UNCHANGED","confidentialityImpact":"LOW","integrityImpact":"NONE","availabilityImpact":"NONE","version":"3.1","vectorString":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N","baseSeverity":"LOW","baseScore":2.7},"format":"CVSS","scenarios":[{"lang":"en","value":"GENERAL"}]}],"problemTypes":[{"descriptions":[{"cweId":"CWE-918","lang":"en","type":"CWE","description":"CWE-918: Server-Side Request Forgery (SSRF)"}]}],"providerMetadata":{"shortName":"Mattermost","orgId":"9302f53e-dde5-4bf3-b2f2-a83f91ac0eee","dateUpdated":"2026-10-26T14:28:23.565Z"},"credits":[{"lang":"en","type":"finder","value":"gevakun"}],"solutions":[{"value":"Update Mattermost to versions 11.11.0, 11.7.11 or higher.","lang":"en"}],"source":{"advisory":"MMSA-2026-00774","defect":["https://mattermost.atlassian.net/browse/MM-70504"],"discovery":"EXTERNAL"},"x_generator":{"engine":"cvelib 1.8.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-93848","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"partial"}],"version":"2.0.3","timestamp":"2026-10-26T15:34:04.498238Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-26T16:46:45.446Z"}}]}}}