CVE-2026-4055— Insufficient permission validation on cross-team playbook run creation
Possible ATT&CK Techniques 1AI
T1136.002 · Domain AccountAffected Version Matrix 5
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Mattermost | Mattermost | 11.5.0≤ 11.5.1 | affected |
11.6.0 | unaffected | ||
11.5.2 | unaffected | ||
10.11.14 | unaffected | ||
11.4.4 | unaffected |
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I. Basic Information for CVE-2026-4055
Vulnerability Information
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Vulnerability Title
Insufficient permission validation on cross-team playbook run creation
Source: NVD (National Vulnerability Database)
Vulnerability 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
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
授权机制不正确
Source: NVD (National Vulnerability Database)
Vulnerability Title
Mattermost 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost是美国Mattermost公司的一个开源协作平台。 Mattermost 11.5.1及之前的11.5.x版本存在安全漏洞，该漏洞源于未能验证针对目标团队的团队级运行创建权限，可能导致经过身份验证的团队成员在缺乏权限的团队中创建运行。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| Mattermost | Mattermost | 11.5.0 ~ 11.5.1 | - |
II. Public POCs for CVE-2026-4055
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Mattermost · 2026-05-21 · 3 CVEs total
| CVE-2026-4858 | 8.0 HIGH | Path traversal in integration action URL leading to arbitrary API execution via system adm |
| CVE-2026-22880 | 6.1 MEDIUM | Mobile SSO authentication flow allows credential theft via malicious server |
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Insufficient input validation in GitHub plugin API causes de
Same vendor: Mattermost
- CVE-2026-4915
Server panic via outgoing webhook responses - CVE-2026-28735
GitHub OAuth Scope Validation - CVE-2026-4635
Persistent notification timing attack causing server denial - CVE-2026-3473
Improper file ownership validation in the Boards API allows - CVE-2026-4646
Insufficient input validation in GitHub plugin API causes de
Same weakness: CWE-863
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GitHub OAuth Scope Validation - CVE-2026-47102
LiteLLM < 1.83.10 Privilege Escalation via User Update
V. Comments for CVE-2026-4055
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