HIGH
An issue was discovered in Mattermost Server before 4.0.0, 3.10.2, and 3.9.2, when Single Sign-On OAuth2 is used
Published Jun 19, 2020
8.1
HIGHCVSS 3.1
EPSS 0.79%
Description
An issue was discovered in Mattermost Server before 4.0.0, 3.10.2, and 3.9.2, when Single Sign-On OAuth2 is used. An attacker could claim somebody else's account.
Affected products
No data.
OR
- < 3.9.2
- ≥ 3.10.0 · < 3.10.2
No data.
No Red Hat product state for this CVE.
github.com/mattermost/mattermost-server
Go
Introduced 3.10.0+incompatible Fixed 3.10.2+incompatible
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| Go | github.com/mattermost/mattermost-server | 3.10.0+incompatible | 3.10.2+incompatible |
Remediation
No remediation recorded yet.
Metrics
No CVSS v4.0 score for this CVE.
8.1 HIGH NVD
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
Attack Vector Network
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality Impact High
Integrity Impact High
Availability Impact None
No CVSS v3.0 score for this CVE.
4.9 MEDIUM NVD
AV:N/AC:M/Au:S/C:P/I:P/A:N
Access Vector Network
Access Complexity Medium
Authentication Single
Confidentiality Impact Partial
Integrity Impact Partial
Availability Impact None
This CVE is not in the KEV list.
No CISA SSVC assessment for this CVE yet.
0.79% 0.00789
Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.
EPSS probability 0.00789
Score over time
2021–2026- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Percentile over time
- EPSS v1
- EPSS v5
- EPSS v2
- EPSS v3
Table of values (9 key points)
Flat stretches are collapsed; showing up to 120 newest points.
| Date | Score | Percentile | Model |
|---|---|---|---|
| Oct 1, 2026 | 0.79% (0.00789) | 54.62th | v5 (v2026.06.15) |
| Sep 20, 2026 | 0.78% (0.00783) | 54.49th | v5 (v2026.06.15) |
| Jul 20, 2024 | 0.07% (0.00065) | 28.82th | v3 (v2023.03.01) |
| Jun 20, 2024 | 0.07% (0.00065) | 28.44th | v3 (v2023.03.01) |
| Mar 7, 2023 | 0.07% (0.00065) | 26.41th | v3 (v2023.03.01) |
| Mar 6, 2023 | 0.89% (0.00885) | 27.89th | v2 (v2022.01.01) |
| Feb 4, 2022 | 0.89% (0.00885) | 10.50th | v2 (v2022.01.01) |
| Feb 3, 2022 | 0.42% (0.00416) | 10.04th | v5 (v2026.06.15) |
| Apr 14, 2021 | 0.42% (0.00416) | 0.00th | v1 |
Weaknesses (2)
References (6)
- https://github.com/advisories/GHSA-fpcr-4rr5-hpcp Advisory
- https://github.com/mattermost/mattermost/commit/259ad46f30d0fac2f7c5c14f3b76b2170f7e90c7
- https://github.com/mattermost/mattermost/commit/b17fca0d5ee7557e3df1cf1d1da8bd749859e35f
- https://github.com/mattermost/mattermost/commit/fbc170733e86f09b46ba754dd03304733d2f482f
- https://mattermost.com/security-updates x_refsource_CONFIRMVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2017-18906
Change history (0)
No recorded changes yet.
Sources
CVE.org / MITRE
Status PUBLISHED
Assigner mitre
Published Jun 19, 2020
Updated Aug 5, 2024
Reserved Jun 19, 2020
Link CVE-2017-18906
CISA Vulnrichment
GHSA-FPCR-4RR5-HPCP Updated n/a