CVE-2026-25783

| EUVD-2026-12416 MEDIUM
2026-03-16 Mattermost GHSA-2v3w-6g35-5f9v
4.3
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

Lifecycle Timeline

4
Patch Released
Mar 31, 2026 - 21:13 nvd
Patch available
Analysis Generated
Mar 16, 2026 - 13:00 vuln.today
EUVD ID Assigned
Mar 16, 2026 - 13:00 euvd
EUVD-2026-12416
CVE Published
Mar 16, 2026 - 12:04 nvd
MEDIUM 4.3

Tags

Information Disclosure Mattermost Suse

Description

Mattermost versions 11.3.x <= 11.3.0, 11.2.x <= 11.2.2, 10.11.x <= 10.11.10 fail to properly validate User-Agent header tokens which allows an authenticated attacker to cause a request panic via a specially crafted User-Agent header. Mattermost Advisory ID: MMSA-2026-00586

Analysis

Mattermost fails to properly validate User-Agent header tokens in versions 11.3.0 and earlier, 11.2.2 and earlier, and 10.11.10 and earlier, allowing authenticated attackers to trigger request panics through specially crafted User-Agent headers. This denial-of-service vulnerability affects availability but requires prior authentication and results in only low-severity impact. …

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Remediation

Within 30 days: Identify affected systems and apply vendor patches as part of regular patch cycle. Monitor vendor channels for patch availability.

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Priority Score

22
Low Medium High Critical
KEV: 0
EPSS: +0.1
CVSS: +22
POC: 0

Vendor Status

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CVE-2026-25783 vulnerability details – vuln.today
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