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CVE-2026-8075— Posting a malicious markdown image crashes the Mattermost Desktop App

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 5.5.13及之前版本和6.0.2及之前版本存在异常处理不当漏洞，该漏洞源于检查标头时未正确进行空检查，可能导致任何用户通过发布缺少标头的恶意链接来使另一个频道成员的Desktop App崩溃。

CVSS 6.5 · Medium EPSS 0.42% · P35

Affected Version Matrix 5

VendorProduct Version RangeStatus
Mattermost Mattermost ≤ 5.5.13 affected
≤ 6.0.2 affected
6.3.0 unaffected
5.13.6.0 unaffected
6.2.1.0 unaffected
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I. Basic Information for CVE-2026-8075

Vulnerability Information
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Vulnerability Title
Posting a malicious markdown image crashes the Mattermost Desktop App
Source: CVE Program / CVE List V5
Vulnerability Description
Mattermost Desktop App versions <=6.2 5.5.13 6.0.2.0 fail to properly null check when checking for headers in the Mattermost Desktop App which allows any user to crash another channel members Desktop App via posting a malicious link with an embedded image that misses one of those headers. Mattermost Advisory ID: MMSA-2026-00668
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
对因果或异常条件的不恰当检查
Source: CVE Program / CVE List V5
Vulnerability Title
Mattermost 异常处理不当漏洞
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 5.5.13及之前版本和6.0.2及之前版本存在异常处理不当漏洞，该漏洞源于检查标头时未正确进行空检查，可能导致任何用户通过发布缺少标头的恶意链接来使另一个频道成员的Desktop App崩溃。
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 0 ~ 5.5.13 -

II. Public POCs for CVE-2026-8075

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III. Intelligence Information for CVE-2026-8075

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IV. Related Vulnerabilities

Same product: Mattermost
Same vendor: Mattermost
Same weakness: CWE-754

V. Comments for CVE-2026-8075

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