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CVE-2026-4055

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CVE-2026-4055

Published: May 21, 2026

Modified: May 21, 2026

PUBLISHED

CVSS v3.1

4.3

MEDIUM

Description

Mattermost versions 11.5.x <= 11.5.1 fail to validate team-level run_create permission against the target team when creating a playbook run which allows an authenticated team member to create runs in teams where they lack permission via specifying a different team ID in the run creation API request. Mattermost Advisory ID: MMSA-2026-00629

VendorProductVersions

Mattermost

Mattermost

affected
11.5.0 - <= 11.5.1
unaffected
11.6.0
unaffected
11.5.2
unaffected
10.11.14
unaffected
11.4.4

Weaknesses (CWE)

CWE-863

CVSS v3.1 Details

CVSS v3.1 Vector

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

Low

Availability

None

References

MMSA-2026-00629
vendor-advisory

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