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CVE-2026-8075

Posting a malicious markdown image crashes the Mattermost Desktop App

Published: Jul 17, 2026Updated: Jul 30, 2026 Sources: CVE List NVDCWE-754
6.5MEDIUM
NVD MITRE
EPSS Score
0.2%
Top 84.9%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:LUI:NS:UC:NI:NA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:LPrivileges Required
Low
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:NConfidentiality
None
I:NIntegrity
None
A:HAvailability
High
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Weaknesses

CWE-754

Affected Products

Mattermost
commercial·US
mattermost desktopOn-premDesktop App
Communications / messaging-chat
MattermostOn-premWeb App
Communications / messaging-chat

Exploitability

Official Patch Available
Is your org exposed to CVE-2026-8075?We can run the check for you — a free external exposure review, no install. Check my exposure

References

https://mattermost.com/security-updates
mattermost.com

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