CVE-2025-9072— One-Click Mattermost Account Takeover via Poisoned RelayState SAML Parameter
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、10.5.9及之前的10.5.x版本和10.9.4及之前的10.9.x版本存在安全漏洞，该漏洞源于未验证redirect_to参数，可能导致攻击者通过特制链接窃取用户cookie。
Possible ATT&CK Techniques 1 AI
T1556.002 · Password Filter DLL
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I. Basic Information for CVE-2025-9072
Vulnerability Information
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Vulnerability Title
One-Click Mattermost Account Takeover via Poisoned RelayState SAML Parameter
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 10.10.x <= 10.10.1, 10.5.x <= 10.5.9, 10.9.x <= 10.9.4 fail to validate the redirect_to parameter, allowing an attacker to craft a malicious link that, once a user authenticates with their SAML provider, could post the user’s cookies to an attacker-controlled URL.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
指向未可信站点的URL重定向(开放重定向)
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、10.5.9及之前的10.5.x版本和10.9.4及之前的10.9.x版本存在安全漏洞，该漏洞源于未验证redirect_to参数，可能导致攻击者通过特制链接窃取用户cookie。
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-2025-9072
| # | POC Description | Source Link | Shenlong Link |
|---|
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Same Patch Batch · Mattermost · 2025-09-15 · 4 CVEs total
| CVE-2025-9076 | 6.5 MEDIUM | Mattermost Server exposes sensitive user credentials during shared channel membership sync |
| 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 weakness: CWE-601
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V. Comments for CVE-2025-9072
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