Input Validation Flaw in Mattermost Affects Performance and Resource Management
CVE-2025-14822

3.1LOW

Key Information:

Vendor

Mattermost
Status
Mattermost
Vendor
CVE Published:
16 January 2026

What is CVE-2025-14822?

Mattermost versions 10.11.x through 10.11.8 include an input validation flaw that allows an authenticated attacker to exploit the hashtag processing feature. By sending a single HTTP request with a post containing an excessive number of space-separated tokens, an attacker can consume significant CPU resources, leading to potential performance degradation and denial of service. This vulnerability highlights the necessity for secure coding practices in input handling to prevent resource exhaustion and maintain system integrity.

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Affected Version(s)

Mattermost 10.11.0 <= 10.11.8

Mattermost 11.2.0

Mattermost 10.11.9

References

https://mattermost.com/security-updates

CVSS V3.1

Score:
3.1
Severity:
LOW
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
High
Privileges Required:
Low
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

CatenaCyber
JSON
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