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CVE-2026-6957

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CVE-2026-6957

Published: May 27, 2026

Modified: May 28, 2026

PUBLISHED

CVSS v3.1

8.0

HIGH

Description

Mattermost Plugins versions <=1.1.5 fail to sanitize filenames received from federated peers before using them to construct export destination paths, which allows an administrator of a remote federated Mattermost server to write files to arbitrary locations within the target server's filestore via a malicious filename delivered through the shared-channel attachment sync protocol. Mattermost Advisory ID: MMSA-2026-00659

VendorProductVersions

Mattermost

Mattermost

affected
0 - <= 1.1.5
unaffected
.0

Weaknesses (CWE)

CWE-22

CVSS v3.1 Details

CVSS v3.1 Vector

CVSS:3.1/AV:N/AC:H/PR:H/UI:N/S:C/C:H/I:H/A:H

Attack Vector

Network

Attack Complexity

High

Privileges Required

High

User Interaction

None

Scope

Changed

Confidentiality

High

Integrity

High

Availability

High

References

MMSA-2026-00659
vendor-advisory

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