9.1crit
CVE-2017-18883
Mattermost Server has low entropy for authorization data as an OAuth 2.0 Service Provider
Also known as GHSA-w8cc-3h7q-jhc3, GO-2025-4198
Published 6 y ago · modified 4 mo ago · JSON
CVSS
9.1
v3.1 · NVD
CISA KEV
No
not known exploited
EPSS
1.1%
percentile 67%
Public exploits
0
none known
Summary
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.
Exploit prediction (EPSS)
1.13% probability of exploitation in the next 30 days, higher than 67% of all scored CVEs.
CVSS scores
| Assigned by | Version | Score | Vector |
|---|---|---|---|
| NVD | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
| NVD | 2.0 | 6.4 | AV:N/AC:L/Au:N/C:P/I:P/A:N |
Affected packages
| Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|
| go | github.com/mattermost/mattermost-server | <4.1.2 >=4.2.0-rc1, <4.2.1 >=4.3.0-rc1, <4.3.0 <4.1.2+incompatible >=4.2.0-rc1+incompatible, <4.2.1+incompatible >=4.3.0-rc1+incompatible, <4.3.0+incompatible | 4.1.2 4.2.1 4.3.0 4.1.2+incompatible 4.2.1+incompatible 4.3.0+incompatible |
Classification
- Weakness
- CWE-331 Insufficient Entropy
References
- mattermost.com /security-updates/ · x_refsource_CONFIRM, x_transferred
- nvd.nist.gov /vuln/detail/CVE-2017-18883 · advisory
- github.com /mattermost/mattermost · package
- mattermost.com /security-updates · web
- github.com /advisories/GHSA-w8cc-3h7q-jhc3 · advisory
Sources
- CVE List: CVE-2017-18883
- GitHub Advisory: GHSA-w8cc-3h7q-jhc3
- NVD: CVE-2017-18883
- OSV: GO-2025-4198
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