High severity8.1NVD Advisory· Published Jun 19, 2020· Updated Jun 17, 2026
CVE-2017-18894
CVE-2017-18894
Description
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. Sometimes. resource-owner authorization is bypassed, allowing account takeover.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected packages
Versions sourced from the GitHub Security Advisory.
| Package | Affected versions | Patched versions |
|---|---|---|
github.com/mattermost/mattermost-serverGo | < 4.0.5 | 4.0.5 |
github.com/mattermost/mattermost-serverGo | >= 4.1.0, < 4.1.1 | 4.1.1 |
github.com/mattermost/mattermost-serverGo | >= 4.2.0-rc1, < 4.2.0 | 4.2.0 |
Affected products
9cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*+ 4 more
- cpe:2.3:a:mattermost:mattermost_server:*:*:*:*:*:*:*:*range: <4.0.5
- cpe:2.3:a:mattermost:mattermost_server:4.2.0:rc1:*:*:*:*:*:*
- cpe:2.3:a:mattermost:mattermost_server:4.2.0:rc2:*:*:*:*:*:*
- cpe:2.3:a:mattermost:mattermost_server:4.2.0:rc3:*:*:*:*:*:*
- cpe:2.3:a:mattermost:mattermost_server:4.2.0:rc4:*:*:*:*:*:*
- Mattermost/Serverdescription
- ghsa-coords3 versionspkg:golang/github.com/mattermost/mattermost-serverpkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Leap%2015.6pkg:rpm/opensuse/govulncheck-vulndb&distro=openSUSE%20Leap%2016.0
< 4.0.5+ 2 more
- (no CPE)range: < 4.0.5
- (no CPE)range: < 0.0.20260114T191543-150000.1.137.1
- (no CPE)range: < 0.0.20260723T184607-160000.1.1
Patches
Vulnerability mechanics
References
4- github.com/advisories/GHSA-gg42-mwr6-p82cghsaADVISORY
- mattermost.com/security-updates/nvdVendor Advisory
- nvd.nist.gov/vuln/detail/CVE-2017-18894ghsaADVISORY
- mattermost.com/security-updatesghsaWEB
News mentions
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