{"id":"CVE-2026-93848","aliases":["EUVD-2026-109939","GHSA-wfp9-hhgh-rm6p"],"status":"published","title":"Mattermost OpenID discovery endpoint request bypasses outbound connection filtering, allowing SSRF by a System Administrator","description":"Mattermost versions 11.7.x \u003c= 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","severity":{"version":"3.1","score":2.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N","level":"low","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-11","score":0.00289,"percentile":0.21686,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-918"],"published":"2026-10-26T14:28:23Z","modified":"2026-11-04T02:48:17Z","products":[{"vendor":"mattermost","product":"mattermost"},{"vendor":"mattermost","product":"mattermost_server"}],"references":[{"url":"https://mattermost.com/security-updates","tags":["vendor-advisory","Vendor Advisory","advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93848","tags":["advisory"]},{"url":"https://github.com/advisories/GHSA-wfp9-hhgh-rm6p"},{"url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/93xxx/CVE-2026-93848.json","tags":["advisory"]}],"sources":{"cve":[{"id":"CVE-2026-93848","title":"Mattermost OpenID discovery endpoint request bypasses outbound connection filtering, allowing SSRF by a System Administrator","description":"Mattermost versions 11.7.x \u003c= 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","status":"published","published":"2026-10-26T14:28:23.565Z","modified":"2026-10-26T16:46:45.446Z","cvss":[{"version":"3.1","score":2.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N","level":"low","assessor":"cna"}],"cwes":["CWE-918"],"updated_at":"2026-11-02T14:19:54.50686Z"}],"euvd":[{"id":"EUVD-2026-109939","description":"Mattermost versions 11.7.x \u003c= 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","status":"published","published":"2026-10-26T14:28:23Z","modified":"2026-10-26T16:46:45Z","cvss":[{"version":"3.1","score":2.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N","level":"low"}],"updated_at":"2026-11-02T16:59:29.132426Z"}],"ghsa":[{"id":"GHSA-wfp9-hhgh-rm6p","title":"Mattermost versions 11.7.x \u003c= 11.7.10 fail to apply outbound internal-connection filtering to the...","description":"Mattermost versions 11.7.x \u003c= 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","status":"published","published":"2026-10-26T15:34:49Z","modified":"2026-10-26T15:34:49Z","cvss":[{"version":"3.1","score":2.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N","level":"low"}],"cwes":["CWE-918"],"updated_at":"2026-11-02T15:14:23.996006Z"}],"nvd":[{"id":"CVE-2026-93848","description":"Mattermost versions 11.7.x \u003c= 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","status":"published","published":"2026-10-26T15:16:46.24Z","modified":"2026-11-02T18:38:09.103Z","cvss":[{"version":"3.1","score":2.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N","level":"low","assessor":"secondary"}],"cwes":["CWE-918"],"updated_at":"2026-11-02T20:51:42.820268Z"}],"osv":[{"id":"CVE-2026-93848","title":"Mattermost OpenID discovery endpoint request bypasses outbound connection filtering, allowing SSRF by a System Administrator","description":"Mattermost versions 11.7.x \u003c= 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","status":"published","published":"2026-10-26T14:28:23.565Z","modified":"2026-11-04T02:48:17.665936821Z","cvss":[{"version":"3.1","score":2.7,"vector":"CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:L/I:N/A:N","level":"low"}],"cwes":["CWE-918"],"updated_at":"2026-11-04T03:25:28.514393Z"}]}}