CVE-2025-6226— IDOR in CreatePost API allows for timeboxed message disclosure
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I. Basic Information for CVE-2025-6226
Vulnerability Information
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Vulnerability Title
IDOR in CreatePost API allows for timeboxed message disclosure
Source: NVD (National Vulnerability Database)
Vulnerability Description
Mattermost versions 10.5.x <= 10.5.6, 10.8.x <= 10.8.1, 10.7.x <= 10.7.3, 9.11.x <= 9.11.16 fail to verify authorization when retrieving cached posts by PendingPostID which allows an authenticated user to read posts in private channels they don't have access to via guessing the PendingPostID of recently created posts.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: NVD (National Vulnerability Database)
Vulnerability Type
关键功能的认证机制缺失
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 10.5.6及之前的10.5.x版本、10.8.1及之前的10.8.x版本、10.7.3及之前的10.7.x版本、9.11.16及之前的9.11.x版本存在安全漏洞，该漏洞源于检索PendingPostID缓存帖子时未验证授权，可能导致认证用户读取无权访问的私人频道帖子。
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 | 10.5.0 ~ 10.5.6 | - |
II. Public POCs for CVE-2025-6226
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Mattermost · 2025-07-18 · 3 CVEs total
| CVE-2025-6233 | 6.8 MEDIUM | Arbitrary file read by system admin via path traversal |
| CVE-2025-6227 | 2.2 LOW | Invite token is used as part of the secure communication |
IV. Related Vulnerabilities
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Unbounded Request Body Read in MS Teams Plugin {{/changes}} - CVE-2026-21388
Unbounded Request Body Read in MS Teams Plugin {{/lifecycle}
Same vendor: Mattermost
- CVE-2026-3590
Race Condition in Guest Magic Link Authentication Allows Tok - CVE-2026-28741
CSRF Protection Bypass Allows Updating a User's Authenticati - CVE-2026-27769
Connected Workspaces: Malicious remote server can manipulate - CVE-2026-24661
Unbounded Request Body Read in MS Teams Plugin {{/changes}} - CVE-2026-21388
Unbounded Request Body Read in MS Teams Plugin {{/lifecycle}
Same weakness: CWE-306
- CVE-2021-47940
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OpenCATS 0.9.4 Remote Code Execution via Resume Upload - CVE-2021-47933
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UGREEN CM933 Administrative missing authentication - CVE-2026-42302
FastGPT: Unauthenticated Remote Code Execution (RCE) via cod
V. Comments for CVE-2025-6226
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