CVE-2025-9076— Mattermost Server exposes sensitive user credentials during shared channel membership synchronization
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 10.10.1及之前的10.10.x版本存在安全漏洞，该漏洞源于共享通道成员同步期间未正确清理用户数据，可能导致恶意或受攻击的远程集群通过未清理的用户对象访问敏感信息。
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I. Basic Information for CVE-2025-9076
Vulnerability Information
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Vulnerability Title
Mattermost Server exposes sensitive user credentials during shared channel membership synchronization
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 10.10.x <= 10.10.1 fail to properly sanitize user data during shared channel membership synchronization, which allows malicious or compromised remote clusters to access sensitive user information via unsanitized user objects. This vulnerability affects Mattermost Server instances with shared channels enabled.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
授权机制缺失
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 10.10.1及之前的10.10.x版本存在安全漏洞，该漏洞源于共享通道成员同步期间未正确清理用户数据，可能导致恶意或受攻击的远程集群通过未清理的用户对象访问敏感信息。
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 | 10.10.0 ~ 10.10.1 | - |
|
II. Public POCs for CVE-2025-9076
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Mattermost · 2025-09-15 · 4 CVEs total
| CVE-2025-9072 | 7.6 HIGH | One-Click Mattermost Account Takeover via Poisoned RelayState SAML Parameter |
| CVE-2025-9078 | 4.3 MEDIUM | Weak cache keys lead to post IDOR and link preview poisoning |
| CVE-2025-9084 | 3.1 LOW | Open redirect in OAuth login |
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Same vendor: Mattermost
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CVE-2026-75587
Plaintext pre-auth secret exposure via Desktop App diagnosti -
CVE-2026-9693
Mattermost thread memberships persist after team removal, ex -
CVE-2026-9859
Mattermost Boards plugin didn’t enforce role-based authoriza -
CVE-2026-9816
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CVE-2026-10080
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Same weakness: CWE-862
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V. Comments for CVE-2025-9076
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