CVE-2017-18889: Input Validation
First published: Fri Jun 19 2020(Updated: )
An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. An attacker could create fictive system-message posts via webhooks and slash commands, in the v3 or v4 REST API.
Credit: cve@mitre.org
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Mattermost | <4.1.2 | |
| Mattermost | >=4.2.0<4.2.1 | |
| Mattermost | =4.3.0-rc1 | |
| Mattermost | =4.3.0-rc2 | |
| Mattermost | =4.3.0-rc3 | |
| Mattermost | =4.3.0-rc4 |
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Reference Links
Frequently Asked Questions
What is the severity of CVE-2017-18889?
CVE-2017-18889 has a medium severity rating, as it allows an attacker to post fictive system messages.
How do I fix CVE-2017-18889?
To mitigate CVE-2017-18889, update Mattermost Server to version 4.3.0 or higher.
What systems are affected by CVE-2017-18889?
CVE-2017-18889 affects Mattermost Server versions below 4.3.0, 4.2.1, and 4.1.2.
What types of attacks are possible with CVE-2017-18889?
With CVE-2017-18889, attackers can exploit webhooks and slash commands to create misleading system message posts.
Are there any workarounds for CVE-2017-18889?
There are no official workarounds for CVE-2017-18889; updating to a patched version is the only solution.
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- agent/weakness
- agent/description
- agent/softwarecombine
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- agent/tags
- collector/nvd-index
- agent/software-canonical-lookup-request
- vendor/mattermost
- canonical/mattermost
- version/mattermost/4.2.0
- version/mattermost/4.3.0-rc1
- version/mattermost/4.3.0-rc2
- version/mattermost/4.3.0-rc3
- version/mattermost/4.3.0-rc4