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CVE-2026-27769

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CVE-2026-27769

Published: Apr 15, 2026

Modified: Apr 15, 2026

PUBLISHED

CVSS v3.1

2.7

LOW

Description

Mattermost versions 10.11.x <= 10.11.12 fail to validate whether users were correctly owned by the correct Connected Workspace which allows a malicious remote server connected using the Conntexted Workspaces feature to change the displayed status of local users via the Connected Workspaces API.. Mattermost Advisory ID: MMSA-2026-00603

VendorProductVersions

Mattermost

Mattermost

affected
10.11.0 - <= 10.11.12
unaffected
11.5.0
unaffected
10.11.13

Weaknesses (CWE)

CWE-862

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

High

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

References

MMSA-2026-00603
vendor-advisory

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