{"id":"EUVD-2026-30741","enisaUuid":"37ece979-5902-36a2-8cc3-5ca8cbba8963","description":"Mattermost versions 11.5.x \u003c\u003d 11.5.1, 10.11.x \u003c\u003d 10.11.13, 11.4.x \u003c\u003d 11.4.3 fail to check the create_post channel permission during post edit operations which allows an authenticated attacker with revoked posting privileges to modify their existing posts via direct API requests to the post update and patch endpoints.. Mattermost Advisory ID: MMSA-2026-00627","datePublished":"May 18, 2026, 6:53:29 AM","dateUpdated":"May 18, 2026, 2:35:00 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-2026-3637\nGHSA-v549-xx3c-6pc8\n","assigner":"Mattermost","epss":0.15,"enisaIdProduct":[{"id":"6528bc66-d912-3769-9f02-e496d7662a74","product":{"name":"Mattermost","vendor":{"name":"Mattermost"}},"product_version":"11.5.0 ≤11.5.1"},{"id":"93bd0995-b8d9-3aaa-8313-2dbc679b7a08","product":{"name":"Mattermost","vendor":{"name":"Mattermost"}},"product_version":"10.11.0 ≤10.11.13"},{"id":"beb0826d-89da-34d4-8c07-9a46415247b3","product":{"name":"Mattermost","vendor":{"name":"Mattermost"}},"product_version":"11.4.0 ≤11.4.3"}],"enisaIdVendor":[{"id":"a06c49eb-b5ef-3d33-9854-ae080d5100c8","vendor":{"name":"Mattermost"}}],"enisaIdVulnerability":[{"id":"396dd157-a5b4-323f-ab43-32ea9d7e9a02","vulnerability":{"id":"CVE-2026-3637","description":"Mattermost versions 11.5.x \u003c\u003d 11.5.1, 10.11.x \u003c\u003d 10.11.13, 11.4.x \u003c\u003d 11.4.3 fail to check the create_post channel permission during post edit operations which allows an authenticated attacker with revoked posting privileges to modify their existing posts via direct API requests to the post update and patch endpoints.. Mattermost Advisory ID: MMSA-2026-00627","datePublished":"May 18, 2026, 6:53:29 AM","dateUpdated":"May 18, 2026, 2:35:00 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-2026-30741\n","assigner":"Mattermost","epss":0.15,"dataProcessed":"Nov 9, 2026, 7:16:09 AM","vulnerabilityProduct":[{"id":"022cd2ab-fab5-3fa2-aa59-35dccf622c37","product":{"name":"Mattermost","vendor":{"name":"Mattermost"}},"product_version":"10.11.0 ≤10.11.13"},{"id":"24ad18a3-1554-379d-ac0d-751296e51008","product":{"name":"Mattermost","vendor":{"name":"Mattermost"}},"product_version":"11.5.0 ≤11.5.1"},{"id":"f91dd979-39bb-33b4-bf90-cfa3182dcaa0","product":{"name":"Mattermost","vendor":{"name":"Mattermost"}},"product_version":"11.4.0 ≤11.4.3"}],"vulnerabilityVendor":[{"id":"c15fecbf-3279-30b7-9ce5-86d999b617aa","vendor":{"name":"Mattermost"}}]}},{"id":"e514d61f-8add-3669-baa7-e6135dc8e8c7","vulnerability":{"id":"GHSA-v549-xx3c-6pc8","description":"Mattermost doesn\u0027t check the create_post channel permission during post edit operations","datePublished":"May 18, 2026, 9:31:47 AM","dateUpdated":"Jun 1, 2026, 3:01:47 PM","baseScore":0.0,"references":"https://nvd.nist.gov/vuln/detail/CVE-2026-3637\nhttps://github.com/mattermost/mattermost/commit/090408f09f53ffc9afc6c65c7c7c1fd3a8cd22f3\nhttps://github.com/mattermost/mattermost\nhttps://mattermost.com/security-updates\n","enisa_id":"EUVD-2026-30741\n","aliases":"CVE-2026-3637\nGHSA-v549-xx3c-6pc8\n","epss":0.0,"dataProcessed":"Nov 8, 2026, 1:57:54 AM","vulnerabilityProduct":[],"vulnerabilityVendor":[]}}],"enisaIdAdvisory":[]}