CVE-2018-21259: Input Validation
First published: Fri Jun 19 2020(Updated: )
An issue was discovered in Mattermost Server before 4.10.1, 4.9.4, and 4.8.2. It allows attackers to cause a denial of service (application hang) via a malformed link in a channel.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Mattermost | <4.8.2 | |
| Mattermost | >=4.9.0<4.9.4 | |
| Mattermost | >=4.10.0<4.10.1 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2018-21259?
CVE-2018-21259 is a denial-of-service vulnerability that can cause application hangs in Mattermost Server.
How do I fix CVE-2018-21259?
To fix CVE-2018-21259, upgrade to Mattermost Server versions 4.10.1, 4.9.4, or 4.8.2 or later.
Which versions of Mattermost Server are affected by CVE-2018-21259?
CVE-2018-21259 affects Mattermost Server versions prior to 4.10.1, 4.9.4, and 4.8.2.
Can CVE-2018-21259 be exploited remotely?
Yes, CVE-2018-21259 can be exploited remotely through a malformed link in a channel.
What are the potential impacts of CVE-2018-21259?
The potential impacts of CVE-2018-21259 include service interruptions and application hangs affecting user access.
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