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CVE-2025-9078— Weak cache keys lead to post IDOR and link preview poisoning

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存在安全漏洞，该漏洞源于未正确验证链接元数据的缓存键，可能导致经过身份验证的用户通过FNV-1哈希冲突攻击访问未经授权的帖子和毒化链接预览。以下版本受到影响：10.8.3及之前的10.8.x版本、10.5.8及之前的10.5.x版本、9.11.17及之前的9.11.x版本、10.10.1及之前的10.10.x版本和10.9.3及之前的10.9.x版本。

CVSS 4.3 · Medium EPSS 0.15% · P5
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I. Basic Information for CVE-2025-9078

Vulnerability Information
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Vulnerability Title
Weak cache keys lead to post IDOR and link preview poisoning
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 10.8.x <= 10.8.3, 10.5.x <= 10.5.8, 9.11.x <= 9.11.17, 10.10.x <= 10.10.1, 10.9.x <= 10.9.3 fail to properly validate cache keys for link metadata which allows authenticated users to access unauthorized posts and poison link previews via hash collision attacks on FNV-1 hashing
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
可逆的单向哈希
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存在安全漏洞，该漏洞源于未正确验证链接元数据的缓存键，可能导致经过身份验证的用户通过FNV-1哈希冲突攻击访问未经授权的帖子和毒化链接预览。以下版本受到影响：10.8.3及之前的10.8.x版本、10.5.8及之前的10.5.x版本、9.11.17及之前的9.11.x版本、10.10.1及之前的10.10.x版本和10.9.3及之前的10.9.x版本。
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 10.8.0 ~ 10.8.3 -

II. Public POCs for CVE-2025-9078

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III. Intelligence Information for CVE-2025-9078

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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-2025-9084 3.1 LOW Open redirect in OAuth login

IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-328

V. Comments for CVE-2025-9078

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