ByteOS Network

NVD Vulnerability Details :

CVE-2026-6961

Received

Source-responsibledisclosure@mattermost.com

Published At-12 Jun, 2026 | 17:16

Updated At-12 Jun, 2026 | 17:16

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

Date Added	Due Date	Vulnerability Name	Required Action
	N/A

Metrics

Type	Version	Base score	Base severity	Vector
Secondary	3.1	7.6	HIGH	CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:C/C:N/I:H/A:L

Type: Secondary

Version: 3.1

Base score: 7.6

Base severity: HIGH

Vector:

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

Weaknesses

CWE ID	Type	Source
CWE-22	Secondary	responsibledisclosure@mattermost.com

CWE ID: CWE-22

Type: Secondary

Source: responsibledisclosure@mattermost.com

References

Hyperlink	Source	Resource
https://mattermost.com/security-updates	responsibledisclosure@mattermost.com	N/A

Hyperlink: https://mattermost.com/security-updates

Source: responsibledisclosure@mattermost.com

Resource: N/A

CISA Catalog

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Change History