{"id":"CVE-2025-20033","aliases":["GHSA-2549-xh72-qrpm","GO-2025-3379"],"title":"Mattermost Improper Validation of Specified Type of Input vulnerability","summary":"Mattermost Improper Validation of Specified Type of Input vulnerability","severity":"medium","cvss":4.3,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L","vendor":"mattermost","product":"github.com/mattermost/mattermost/server/v8","ecosystem":"go","affected":["github.com/mattermost/mattermost/server/v8 >= 9.11.0, < 9.11.16","github.com/mattermost/mattermost/server/v8 >= 10.0.0, < 10.0.4","github.com/mattermost/mattermost/server/v8 >= 10.1.0, < 10.1.4","github.com/mattermost/mattermost/server/v8 >= 10.2.0, < 10.2.1","github.com/mattermost/mattermost/server/v8 < 8.0.0-20250102081831-64c566a8280b"],"patched":["github.com/mattermost/mattermost/server/v8 9.11.16","github.com/mattermost/mattermost/server/v8 10.0.4","github.com/mattermost/mattermost/server/v8 10.1.4","github.com/mattermost/mattermost/server/v8 10.2.1","github.com/mattermost/mattermost/server/v8 8.0.0-20250102081831-64c566a8280b"],"published":"2025-01-09","updated":"2026-09-10","sourceUpdated":"2026-09-10T03:50:56.279038415Z","source":"OSV","sourceUrl":"https://osv.dev/vulnerability/GHSA-2549-xh72-qrpm","references":[{"url":"https://nvd.nist.gov/vuln/detail/CVE-2025-20033"},{"url":"https://github.com/mattermost/mattermost"},{"url":"https://mattermost.com/security-updates"}],"tags":["osv","go"],"epss":0.00616,"epssPercentile":0.48134,"ingestedAt":"2026-09-12T03:13:01.744Z","slug":"CVE-2025-20033","body":"## Overview\n\nMattermost versions 10.2.0, 9.11.x <= 9.11.5, 10.0.x <= 10.0.3, 10.1.x <= 10.1.3 fail to properly validate post types, which allows attackers to deny service to users with the sysconsole_read_plugins permission via creating a post with the custom_pl_notification type and specific props.\n\n## Affected packages\n\n- `github.com/mattermost/mattermost/server/v8 >= 9.11.0, < 9.11.16`\n- `github.com/mattermost/mattermost/server/v8 >= 10.0.0, < 10.0.4`\n- `github.com/mattermost/mattermost/server/v8 >= 10.1.0, < 10.1.4`\n- `github.com/mattermost/mattermost/server/v8 >= 10.2.0, < 10.2.1`\n- `github.com/mattermost/mattermost/server/v8 < 8.0.0-20250102081831-64c566a8280b`\n\n## Remediation\n\nUpgrade to a patched release:\n\n- `github.com/mattermost/mattermost/server/v8 9.11.16`\n- `github.com/mattermost/mattermost/server/v8 10.0.4`\n- `github.com/mattermost/mattermost/server/v8 10.1.4`\n- `github.com/mattermost/mattermost/server/v8 10.2.1`\n- `github.com/mattermost/mattermost/server/v8 8.0.0-20250102081831-64c566a8280b`","depth":"sunlit","depthScore":24,"depthScoreParts":{"impact":23.7,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}