CVE-2025-6226— IDOR in CreatePost API allows for timeboxed message disclosure
Quick assessment
Affected
Mattermost Mattermost
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.
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。
Possible ATT&CK Techniques 1 AI
T1530 · Data from Cloud Storage
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
关键功能的认证机制缺失
Source: CVE Program / CVE List V5
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 |
|---|
AI-Generated POC
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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 |
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V. Comments for CVE-2025-6226
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