CVE-2025-9084— Open redirect in OAuth login
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 10.5.9及之前的10.5.x版本存在安全漏洞，该漏洞源于未正确验证重定向URL，可能导致攻击者通过特制OAuth登录URL将用户重定向到恶意站点。
Possible ATT&CK Techniques 1 AI
T1189 · Drive-by Compromise
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I. Basic Information for CVE-2025-9084
Vulnerability Information
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Vulnerability Title
Open redirect in OAuth login
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 10.5.x <= 10.5.9 fail to properly validate redirect URLs which allows attackers to redirect users to malicious sites via crafted OAuth login URLs
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:N/I:L/A:N
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 10.5.9及之前的10.5.x版本存在安全漏洞，该漏洞源于未正确验证重定向URL，可能导致攻击者通过特制OAuth登录URL将用户重定向到恶意站点。
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 ~ 10.5.9 | - |
|
II. Public POCs for CVE-2025-9084
| # | POC Description | Source Link | Shenlong Link |
|---|
AI-Generated POC
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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-2025-9076 | 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 |
IV. Related Vulnerabilities
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Same vendor: Mattermost
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CVE-2026-75587
Plaintext pre-auth secret exposure via Desktop App diagnosti -
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CVE-2026-9859
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CVE-2026-9816
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Same weakness: CWE-601
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V. Comments for CVE-2025-9084
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