What is CVE-2017-18897?

CVE-2017-18897 is a vulnerability in Mattermost Server before version 4.2.0, 4.1.1, and 4.0.5 when used as an OAuth 2.0 service provider.

How does CVE-2017-18897 affect Mattermost Server?

CVE-2017-18897 affects Mattermost Server when used as an OAuth 2.0 service provider and mishandles a deny action for a redirection.

What is the severity level of CVE-2017-18897?

CVE-2017-18897 has a severity level of medium with a CVSS score of 6.1.

Which versions of Mattermost Server are affected by CVE-2017-18897?

Mattermost Server versions 4.0.5, 4.1.0, 4.1.1, and 4.2.0-rc1, 4.2.0-rc2, 4.2.0-rc3, and 4.2.0-rc4 are affected by CVE-2017-18897.

How can I fix CVE-2017-18897?

To fix CVE-2017-18897, upgrade your Mattermost Server to version 4.2.0 or higher.

Vulnerability/
CVE-2017-18897

medium

6.1

CWE

601

19/6/2020

5/8/2024

CVE-2017-18897

First published: Fri Jun 19 2020(Updated: )

An issue was discovered in Mattermost Server before 4.2.0, 4.1.1, and 4.0.5, when used as an OAuth 2.0 service provider. It mishandles a deny action for a redirection.

Credit: cve@mitre.org

Affected Software	Affected Version	How to fix
Mattermost Mattermost Server	<4.0.5
Mattermost Mattermost Server	>=4.1.0<4.1.1
Mattermost Mattermost Server	=4.2.0-rc1
Mattermost Mattermost Server	=4.2.0-rc2
Mattermost Mattermost Server	=4.2.0-rc3
Mattermost Mattermost Server	=4.2.0-rc4

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Reference Links

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

Frequently Asked Questions

What is CVE-2017-18897?
CVE-2017-18897 is a vulnerability in Mattermost Server before version 4.2.0, 4.1.1, and 4.0.5 when used as an OAuth 2.0 service provider.
How does CVE-2017-18897 affect Mattermost Server?
CVE-2017-18897 affects Mattermost Server when used as an OAuth 2.0 service provider and mishandles a deny action for a redirection.
What is the severity level of CVE-2017-18897?
CVE-2017-18897 has a severity level of medium with a CVSS score of 6.1.
Which versions of Mattermost Server are affected by CVE-2017-18897?
Mattermost Server versions 4.0.5, 4.1.0, 4.1.1, and 4.2.0-rc1, 4.2.0-rc2, 4.2.0-rc3, and 4.2.0-rc4 are affected by CVE-2017-18897.
How can I fix CVE-2017-18897?
To fix CVE-2017-18897, upgrade your Mattermost Server to version 4.2.0 or higher.

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version/mattermost mattermost server/4.1.0
version/mattermost mattermost server/4.2.0-rc1
version/mattermost mattermost server/4.2.0-rc2
version/mattermost mattermost server/4.2.0-rc3
version/mattermost mattermost server/4.2.0-rc4

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