{"id":"EUVD-2026-36501","enisaUuid":"6934da0e-5e3e-371a-a55d-922eb7a410cf","description":"Mattermost versions 11.6.x \u003c\u003d 11.6.1, 11.5.x \u003c\u003d 11.5.4, 10.11.x \u003c\u003d 10.11.15, 10.11.x \u003c\u003d 10.11.16 Fail to enforce PermissionInviteUser when setting AllowOpenInvite or AllowedDomains during team creation (the check was only applied on update/patch), which allows an authenticated user holding PermissionCreateTeam but not PermissionInviteUser on the resulting team to configure invite-controlled team settings (make the team publicly joinable via open invite and/or constrain membership via allowed domains) that they are not permitted to set on an existing team via POST /api/v4/teams with allow_open_invite: true and/or a non-empty allowed_domains in the request body.. Mattermost Advisory ID: MMSA-2026-00655","datePublished":"Jun 12, 2026, 3:51:30 PM","dateUpdated":"Jun 12, 2026, 5:18:52 PM","baseScore":4.3,"baseScoreVersion":"3.1","baseScoreVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","references":"https://mattermost.com/security-updates\n","aliases":"CVE-2026-6689\nGHSA-c28q-m4gf-vg4q\n","assigner":"Mattermost","epss":0.15,"enisaIdProduct":[{"id":"8b92857f-192f-34ec-9292-5fb17dffa3f4","product":{"name":"Mattermost","vendor":{"name":"Mattermost"}},"product_version":"11.6.0 ≤11.6.1"},{"id":"9498b678-796f-3652-925e-61bab3b869e1","product":{"name":"Mattermost","vendor":{"name":"Mattermost"}},"product_version":"11.5.0 ≤11.5.4"},{"id":"cf9155d0-a48a-31c1-b41f-a968793b955c","product":{"name":"Mattermost","vendor":{"name":"Mattermost"}},"product_version":"10.11.0 ≤10.11.15"},{"id":"fce8d99d-12ec-3842-a483-09bcc10e129c","product":{"name":"Mattermost","vendor":{"name":"Mattermost"}},"product_version":"10.11.0 ≤10.11.16"}],"enisaIdVendor":[{"id":"bbcbe32d-9885-342b-b467-07651a699235","vendor":{"name":"Mattermost"}}],"enisaIdVulnerability":[{"id":"95aeb2ea-1ce7-3b2a-8ddc-d349ac060e64","vulnerability":{"id":"CVE-2026-6689","description":"Mattermost versions 11.6.x \u003c\u003d 11.6.1, 11.5.x \u003c\u003d 11.5.4, 10.11.x \u003c\u003d 10.11.15, 10.11.x \u003c\u003d 10.11.16 Fail to enforce PermissionInviteUser when setting AllowOpenInvite or AllowedDomains during team creation (the check was only applied on update/patch), which allows an authenticated user holding PermissionCreateTeam but not PermissionInviteUser on the resulting team to configure invite-controlled team settings (make the team publicly joinable via open invite and/or constrain membership via allowed domains) that they are not permitted to set on an existing team via POST /api/v4/teams with allow_open_invite: true and/or a non-empty allowed_domains in the request body.. Mattermost Advisory ID: MMSA-2026-00655","datePublished":"Jun 12, 2026, 3:51:30 PM","dateUpdated":"Jun 12, 2026, 5:18:52 PM","status":"PUBLISHED","baseScore":4.3,"baseScoreVersion":"3.1","baseScoreVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N","references":"https://mattermost.com/security-updates\n","enisa_id":"EUVD-2026-36501\n","assigner":"Mattermost","epss":0.15,"dataProcessed":"Nov 13, 2026, 7:21:57 AM","vulnerabilityProduct":[{"id":"2b39560e-cdb0-3bf4-91a8-9c4dd181385d","product":{"name":"Mattermost","vendor":{"name":"Mattermost"}},"product_version":"10.11.0 ≤10.11.16"},{"id":"a50e3ed0-1ca2-309d-9dbc-2c145dcf05ec","product":{"name":"Mattermost","vendor":{"name":"Mattermost"}},"product_version":"10.11.0 ≤10.11.15"},{"id":"a8e23cbf-3d13-3488-afd4-42bd4403f97c","product":{"name":"Mattermost","vendor":{"name":"Mattermost"}},"product_version":"11.6.0 ≤11.6.1"},{"id":"cd3aa76d-268e-3510-8619-28cbc28de20c","product":{"name":"Mattermost","vendor":{"name":"Mattermost"}},"product_version":"11.5.0 ≤11.5.4"}],"vulnerabilityVendor":[{"id":"7a641ef1-8f0e-3a13-becc-fe16bc4bf858","vendor":{"name":"Mattermost"}}]}},{"id":"c61c50c6-2bd4-3ba4-b6bb-070b8a8eee7a","vulnerability":{"id":"GHSA-c28q-m4gf-vg4q","description":"Mattermost doesn\u0027t enforce PermissionInviteUser when setting AllowOpenInvite or AllowedDomains during team creation","datePublished":"Jun 12, 2026, 6:31:59 PM","dateUpdated":"Aug 24, 2026, 9:35:43 PM","baseScore":0.0,"references":"https://nvd.nist.gov/vuln/detail/CVE-2026-6689\nhttps://github.com/mattermost/mattermost/pull/36402\nhttps://github.com/mattermost/mattermost/pull/36384\nhttps://github.com/mattermost/mattermost/pull/36383\nhttps://github.com/mattermost/mattermost/pull/36375\nhttps://github.com/mattermost/mattermost/pull/36188\nhttps://github.com/mattermost/mattermost/commit/977c791e5b54bc14fdb96a2b3dacc85da5d8c623\nhttps://github.com/mattermost/mattermost/commit/7d6816abdfd170169f717aea43c5716a1f9ef6b0\nhttps://github.com/mattermost/mattermost/commit/479fc42d0ec6da48e76b59608233d90bfc69769d\nhttps://github.com/mattermost/mattermost/commit/3a96344214b1a84df70d97052d46b6f2b40b0caa\nhttps://github.com/mattermost/mattermost/commit/2dea05864024b3254fb28c5ed679592e2b7cd672\nhttps://github.com/mattermost/mattermost/releases/tag/v10.11.16\nhttps://github.com/mattermost/mattermost/releases/tag/v11.5.5\nhttps://github.com/mattermost/mattermost/releases/tag/v11.6.2\nhttps://github.com/mattermost/mattermost/releases/tag/v11.7.0\nhttps://mattermost.com/security-updates\nhttps://github.com/mattermost/mattermost\n","enisa_id":"EUVD-2026-36501\n","aliases":"GHSA-c28q-m4gf-vg4q\nCVE-2026-6689\n","epss":0.0,"dataProcessed":"Nov 9, 2026, 3:49:06 PM","vulnerabilityProduct":[],"vulnerabilityVendor":[]}}],"enisaIdAdvisory":[]}