What’s Vulnerable › Vulnerabilities
CVE-2017-18883
- Severity: critical (CVSS 9.1 v3.1)
- Exploited in the wild: not listed in CISA KEV
- EPSS: 1.1% probability of exploitation in the next 30 days
- Public exploit or detection template: none known
- Published: 2020-06-19 · updated 2026-06-17
- Weakness: CWE-331
Description
An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2, when serving as an OAuth 2.0 Service Provider. There is low entropy for authorization data.
Affected products
- Mattermost: before 4.1.2; from 4.2.0 before 4.2.1; 4.3.0-rc1, 4.3.0-rc2, 4.3.0-rc3, 4.3.0-rc4 — fixed in 4.1.2, 4.2.1
How to fix
Upgrade to a fixed version: Mattermost 4.1.2, 4.2.1. Check the vendor advisory for mitigations.
References
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