{"id":"EUVD-2026-30740","enisaUuid":"26775e02-3b9a-35ed-916b-ab7c9bd343cb","description":"Mattermost versions 11.5.x \u003c\u003d 11.5.1, 10.11.x \u003c\u003d 10.11.13 fail to validate that the RefreshedToken differs from the original invite token during remote cluster invite confirmation which allows an authenticated attacker to bypass token rotation and reuse the original invite token via sending a crafted invite confirmation with a RefreshedToken matching the original token. Mattermost Advisory ID: MMSA-2026-00575","datePublished":"May 18, 2026, 6:56:11 AM","dateUpdated":"May 18, 2026, 2:34:29 PM","baseScore":3.7,"baseScoreVersion":"3.1","baseScoreVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","references":"https://mattermost.com/security-updates\n","aliases":"CVE-2026-4273\nGHSA-hqpj-f3jh-29vx\n","assigner":"Mattermost","epss":0.14,"enisaIdProduct":[{"id":"8fcd8046-f518-3021-badf-11d364ad7dbe","product":{"name":"Mattermost","vendor":{"name":"Mattermost"}},"product_version":"11.5.0 ≤11.5.1"},{"id":"d51ae14c-e8a6-3ac4-acdc-9446b1050cf5","product":{"name":"Mattermost","vendor":{"name":"Mattermost"}},"product_version":"10.11.0 ≤10.11.13"}],"enisaIdVendor":[{"id":"ac9caef8-f672-31c0-af61-c755ccc1d757","vendor":{"name":"Mattermost"}}],"enisaIdVulnerability":[{"id":"b274da9a-08a0-39db-bf31-7c72e6717d9c","vulnerability":{"id":"CVE-2026-4273","description":"Mattermost versions 11.5.x \u003c\u003d 11.5.1, 10.11.x \u003c\u003d 10.11.13 fail to validate that the RefreshedToken differs from the original invite token during remote cluster invite confirmation which allows an authenticated attacker to bypass token rotation and reuse the original invite token via sending a crafted invite confirmation with a RefreshedToken matching the original token. Mattermost Advisory ID: MMSA-2026-00575","datePublished":"May 18, 2026, 6:56:11 AM","dateUpdated":"May 18, 2026, 2:34:29 PM","status":"PUBLISHED","baseScore":3.7,"baseScoreVersion":"3.1","baseScoreVector":"CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:N","references":"https://mattermost.com/security-updates\n","enisa_id":"EUVD-2026-30740\n","assigner":"Mattermost","epss":0.14,"dataProcessed":"Nov 5, 2026, 7:17:06 AM","vulnerabilityProduct":[{"id":"1fc758b4-181a-340d-90d6-cc8ec34c2232","product":{"name":"Mattermost","vendor":{"name":"Mattermost"}},"product_version":"11.5.0 ≤11.5.1"},{"id":"62f7cc41-cecb-3d9f-9059-efceb17b6d6f","product":{"name":"Mattermost","vendor":{"name":"Mattermost"}},"product_version":"10.11.0 ≤10.11.13"}],"vulnerabilityVendor":[{"id":"818c2aac-1c21-3d45-882e-57dc2145267b","vendor":{"name":"Mattermost"}}]}},{"id":"eb73e508-0252-3871-afb8-53982d0f8976","vulnerability":{"id":"GHSA-hqpj-f3jh-29vx","description":"Mattermost doesn\u0027t validate that the RefreshedToken differs from the original invite token during remote cluster invite confirmation","datePublished":"May 18, 2026, 9:31:47 AM","dateUpdated":"Jun 1, 2026, 3:53:25 PM","baseScore":0.0,"references":"https://nvd.nist.gov/vuln/detail/CVE-2026-4273\nhttps://github.com/mattermost/mattermost/commit/742e0be9507454a7e662668e1d9ec1b94b636e9b\nhttps://github.com/mattermost/mattermost\nhttps://mattermost.com/security-updates\n","enisa_id":"EUVD-2026-30740\n","aliases":"CVE-2026-4273\nGHSA-hqpj-f3jh-29vx\n","epss":0.0,"dataProcessed":"Nov 1, 2026, 2:00:21 AM","vulnerabilityProduct":[],"vulnerabilityVendor":[]}}],"enisaIdAdvisory":[]}