CVE-2026-8075 | Mattermost Desktop App versions <=6.2 5.5.13 6.0.2.0 fail to… | CVSS 6.5 MEDIUM

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

Metadata

CVE ID: CVE-2026-8075
State: PUBLISHED
Assigner: Mattermost
Reserved: 2026-05-07 10:57 UTC
Published: 2026-07-17 10:05 UTC
Last updated: 2026-07-17 12:53 UTC
Primary CWE: CWE-754
CWE-754: Improper Check for Unusual or Exceptional Condition…
Vendor / Product: Mattermost / Mattermost
Sources: cve.org · NVD

Severity & Metrics

6.5 MEDIUM CVSS 3.1

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

SSVC — CISA Coordinator

Exploitation: none
Automatable: no
Tech. Impact: partial

Affected products (1)

Vendor	Product	Platform	Versions
Mattermost	Mattermost	—	0 ≤ 5.5.13, 0 ≤ 6.0.2, 6.3.0, 5.13.6.0 …

Weakness (CWE)

CWE	Source	Description
CWE-754	cna	CWE-754: Improper Check for Unusual or Exceptional Conditions

CVSS scores (1)

Score	Severity	Version	Source	Vector
6.5	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References (1)

MMSA-2026-00668 https://mattermost.com/security-updates