{"items":[{"id":"NVI-00017825","kind":"vulnerability","title":"Mattermost doesn't validate file ownership and access control","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-7pf2-9c95-w332","CVE-2026-3473"],"plain_summary":"GitHub lists this reviewed advisory for github.com/mattermost/mattermost-server, github.com/mattermost/mattermost-server, github.com/mattermost/mattermost-server, github.com/mattermost/mattermost-server. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-6ff39ddaeb08b3cc79211671e05c6450"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[{"kind":"CVSS","as_of":"2026-06-26T22:48:16.000Z","value":"7.1 high","meaning":"GitHub source severity; exploitability and local consequence require separate evidence.","source_id":"sr-6ff39ddaeb08b3cc79211671e05c6450"}],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-6ff39ddaeb08b3cc79211671e05c6450","url":"https://github.com/advisories/GHSA-7pf2-9c95-w332","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-7pf2-9c95-w332","publisher":"GitHub Advisory Database","observed_at":"2026-11-05T19:05:04.022Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-6ff39ddaeb08b3cc79211671e05c6450"],"technology":"github.com/mattermost/mattermost-server","known_exclusions":[],"conditions_summary":"Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to validate file ownership and access control, which allows an authenticated user to access and download files belonging to other users or teams via crafted Boards API requests using valid file IDs. Mattermost Advisory ID: MMSA-2026-00620.","public_affected_ranges":["= 11.6.0"]},{"certainty":"source_listed","source_ids":["sr-6ff39ddaeb08b3cc79211671e05c6450"],"technology":"github.com/mattermost/mattermost-server","known_exclusions":[],"conditions_summary":"Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to validate file ownership and access control, which allows an authenticated user to access and download files belonging to other users or teams via crafted Boards API requests using valid file IDs. Mattermost Advisory ID: MMSA-2026-00620.","public_affected_ranges":[">= 11.5.0, < 11.5.4"]},{"certainty":"source_listed","source_ids":["sr-6ff39ddaeb08b3cc79211671e05c6450"],"technology":"github.com/mattermost/mattermost-server","known_exclusions":[],"conditions_summary":"Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to validate file ownership and access control, which allows an authenticated user to access and download files belonging to other users or teams via crafted Boards API requests using valid file IDs. Mattermost Advisory ID: MMSA-2026-00620.","public_affected_ranges":[">= 11.4.0, < 11.4.5"]},{"certainty":"source_listed","source_ids":["sr-6ff39ddaeb08b3cc79211671e05c6450"],"technology":"github.com/mattermost/mattermost-server","known_exclusions":[],"conditions_summary":"Mattermost versions 11.6.x <= 11.6.0, 11.5.x <= 11.5.3, 11.4.x <= 11.4.4, 10.11.x <= 10.11.14 fail to validate file ownership and access control, which allows an authenticated user to access and download files belonging to other users or teams via crafted Boards API requests using valid file IDs. Mattermost Advisory ID: MMSA-2026-00620.","public_affected_ranges":[">= 10.11.0, < 10.11.15"]}],"null_published_at":"2026-11-05T19:10:21.472Z","source_updated_at":"2026-06-26T22:48:16.000Z","source_disclosed_at":"2026-05-26T13:30:15.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-05T19:05:04.022Z"}],"next_cursor":null,"snapshot_revision":"42594"}