{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/96153?format=json","vulnerability_id":"VCID-23nv-xqcm-gfa8","summary":"Mattermost versions 10.12.x <= 10.12.1, 10.11.x <= 10.11.4, 10.5.x <= 10.5.12, 11.0.x <= 11.0.3 fail to properly validate OAuth state tokens during OpenID Connect authentication which allows an authenticated attacker with team creation privileges to take over a user account via manipulation of authentication data during the OAuth completion flow. This requires email verification to be disabled (default: disabled), OAuth/OpenID Connect to be enabled, and the attacker to control two users in the SSO system with one of them never having logged into Mattermost.","aliases":[{"alias":"CVE-2025-12419"},{"alias":"GHSA-3x39-62h4-f8j6"}],"fixed_packages":[],"affected_packages":[],"references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2025-12419","reference_id":"","reference_type":"","scores":[{"value":"0.00086","scoring_system":"epss","scoring_elements":"0.24967","published_at":"2026-06-13T12:55:00Z"},{"value":"0.00086","scoring_system":"epss","scoring_elements":"0.2495","published_at":"2026-06-14T12:55:00Z"},{"value":"0.00086","scoring_system":"epss","scoring_elements":"0.24754","published_at":"2026-06-11T12:55:00Z"},{"value":"0.00086","scoring_system":"epss","scoring_elements":"0.24953","published_at":"2026-06-12T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2025-12419"},{"reference_url":"https://github.com/advisories/GHSA-3x39-62h4-f8j6","reference_id":"","reference_type":"","scores":[{"value":"9.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/advisories/GHSA-3x39-62h4-f8j6"},{"reference_url":"https://github.com/mattermost/mattermost","reference_id":"","reference_type":"","scores":[{"value":"9.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/mattermost/mattermost"},{"reference_url":"https://github.com/mattermost/mattermost/commit/15364790cc277cfaa372693d2d5442b87f70fd42","reference_id":"","reference_type":"","scores":[{"value":"9.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/mattermost/mattermost/commit/15364790cc277cfaa372693d2d5442b87f70fd42"},{"reference_url":"https://github.com/mattermost/mattermost/commit/364c2203de00fe0d8424b6b46d6f0eeb02a2539a","reference_id":"","reference_type":"","scores":[{"value":"9.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/mattermost/mattermost/commit/364c2203de00fe0d8424b6b46d6f0eeb02a2539a"},{"reference_url":"https://github.com/mattermost/mattermost/commit/46b5c436bb3093cc1da3fa2455f93d4c52389eee","reference_id":"","reference_type":"","scores":[{"value":"9.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/mattermost/mattermost/commit/46b5c436bb3093cc1da3fa2455f93d4c52389eee"},{"reference_url":"https://github.com/mattermost/mattermost/commit/c3f4818afe46a7084740e809708ae22641c76d8d","reference_id":"","reference_type":"","scores":[{"value":"9.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/mattermost/mattermost/commit/c3f4818afe46a7084740e809708ae22641c76d8d"},{"reference_url":"https://github.com/mattermost/mattermost/commit/d3ed703dc8330684952eb8d49a375bac6ea7b0c6","reference_id":"","reference_type":"","scores":[{"value":"9.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/mattermost/mattermost/commit/d3ed703dc8330684952eb8d49a375bac6ea7b0c6"},{"reference_url":"https://github.com/mattermost/mattermost/pull/34296","reference_id":"","reference_type":"","scores":[{"value":"9.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/mattermost/mattermost/pull/34296"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2025-12419","reference_id":"","reference_type":"","scores":[{"value":"9.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-12419"},{"reference_url":"https://mattermost.com/security-updates","reference_id":"security-updates","reference_type":"","scores":[{"value":"9.9","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H"},{"value":"CRITICAL","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:N/T:T/P:M/B:A/M:M/D:T/2025-11-28T15:21:17Z/"}],"url":"https://mattermost.com/security-updates"}],"weaknesses":[{"cwe_id":303,"name":"Incorrect Implementation of Authentication Algorithm","description":"The requirements for the product dictate the use of an established authentication algorithm, but the implementation of the algorithm is incorrect."},{"cwe_id":287,"name":"Improper Authentication","description":"When an actor claims to have a given identity, the product does not prove or insufficiently proves that the claim is correct."}],"exploits":[],"severity_range_score":"9.0 - 10.0","exploitability":null,"weighted_severity":null,"risk_score":null,"resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-23nv-xqcm-gfa8"}