| 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 |
|---|---|
| Publication Date | May 22, 2026, 8:16 p.m. |
| Registration Date | May 27, 2026, 4:05 a.m. |
| Last Update | May 23, 2026, 2:21 a.m. |
| CVSS3.1 : HIGH | |
| スコア | 7.1 |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:N |
| 攻撃元区分(AV) | ネットワーク |
| 攻撃条件の複雑さ(AC) | 低 |
| 攻撃に必要な特権レベル(PR) | 低 |
| 利用者の関与(UI) | 不要 |
| 影響の想定範囲(S) | 変更なし |
| 機密性への影響(C) | 高 |
| 完全性への影響(I) | 低 |
| 可用性への影響(A) | なし |
| Configuration1 | or higher | or less | more than | less than | |
| cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | 10.11.0 | 10.11.15 | |||
| cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | 11.4.0 | 11.4.5 | |||
| cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | 11.5.0 | 11.5.4 | |||
| cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:* | 11.6.0 | 11.6.1 | |||