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CVE-2026-7521— SAML certificate deletion allows path traversal to delete arbitrary files outside the config directory

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公司开源的一个开源协作平台。 Mattermost 11.8.0及之前的11.8.x版本、11.7.3及之前的11.7.x版本、11.6.5及之前的11.6.x版本和10.11.20及之前的10.11.x版本存在路径遍历漏洞，该漏洞源于未验证文件删除路径，可能导致具有SAML系统控制台写入权限的管理员通过删除文件端点删除配置目录之外的任意文件。

CVSS 5.5 · Medium EPSS 0.44% · P37

Possible ATT&CK Techniques 1 AI

T1530 · Data from Cloud Storage

Affected Version Matrix 9

VendorProduct Version RangeStatus
Mattermost Mattermost 11.8.0≤ 11.8.0 affected
11.7.0≤ 11.7.3 affected
11.6.0≤ 11.6.5 affected
10.11.0≤ 10.11.20 affected
11.9.0 unaffected
11.8.1 unaffected
11.7.4 unaffected
11.6.6 unaffected
… +1 more rows
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I. Basic Information for CVE-2026-7521

Vulnerability Information
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Vulnerability Title
SAML certificate deletion allows path traversal to delete arbitrary files outside the config directory
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost versions 11.8.x <= 11.8.0, 11.7.x <= 11.7.3, 11.6.x <= 11.6.5, 10.11.x <= 10.11.20 fail to verify file deletion path which allows an admin with SAML system-console write permissions to delete arbitrary files outside the config directory from the server via the remove file endpoint.. Mattermost Advisory ID: MMSA-2026-00666
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:L/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对路径名的限制不恰当(路径遍历)
Source: CVE Program / CVE List V5
Vulnerability Title
Mattermost 路径遍历漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mattermost是美国Mattermost公司开源的一个开源协作平台。 Mattermost 11.8.0及之前的11.8.x版本、11.7.3及之前的11.7.x版本、11.6.5及之前的11.6.x版本和10.11.20及之前的10.11.x版本存在路径遍历漏洞，该漏洞源于未验证文件删除路径，可能导致具有SAML系统控制台写入权限的管理员通过删除文件端点删除配置目录之外的任意文件。
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 11.8.0 ~ 11.8.0 -

II. Public POCs for CVE-2026-7521

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III. Intelligence Information for CVE-2026-7521

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IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-22

V. Comments for CVE-2026-7521

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