| Summary | Mattermost versions 11.6.x <= 11.6.1, 11.5.x <= 11.5.4, 10.11.x <= 10.11.15, 10.11.x <= 10.11.16 Mattermost fails to sanitize FileInfo.Name received from federated peers during shared channel file sync, which allows an attacker who controls a federated server to write files to arbitrary locations within the target server's filestore via path traversal sequences in the filename field.. Mattermost Advisory ID: MMSA-2026-00661 |
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| Publication Date | June 13, 2026, 2:16 a.m. |
| Registration Date | June 13, 2026, 4:18 a.m. |
| Last Update | June 13, 2026, 2:16 a.m. |
| CVSS3.1 : HIGH | |
| スコア | 7.6 |
|---|---|
| Vector | CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:L |
| 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) | 高 |
| 利用者の関与(UI) | 不要 |
| 影響の想定範囲(S) | 変更あり |
| 機密性への影響(C) | なし |
| 完全性への影響(I) | 高 |
| 可用性への影響(A) | 低 |