CVE-2017-18917 — An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7

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HIGH

An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7

Published Jun 19, 2020

8.8

HIGH

CVSS 4.0

EPSS 0.72%

Description

An issue was discovered in Mattermost Server before 3.8.2, 3.7.5, and 3.6.7. Weak hashing was used for e-mail invitations, OAuth, and e-mail verification tokens.

Affected products

github.com/mattermost/mattermost-server

Go

Introduced 3.8.0+incompatible Fixed 3.8.2+incompatible

Ecosystem	Package	Introduced	Fixed
Go	github.com/mattermost/mattermost-server	3.8.0+incompatible	3.8.2+incompatible

Remediation

No remediation recorded yet.

Metrics

0.72% 0.00717

Estimated probability of exploitation in the wild in the next 30 days (FIRST EPSS). As of Oct 1, 2026.

EPSS probability 0.00717

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	0.72% (0.00717)	52.10th	v5 (v2026.06.15)
Sep 20, 2026	0.71% (0.00711)	52.12th	v5 (v2026.06.15)
Jul 20, 2024	0.17% (0.00168)	54.13th	v3 (v2023.03.01)
Jul 10, 2024	0.17% (0.00168)	54.04th	v3 (v2023.03.01)
Mar 7, 2023	0.17% (0.00168)	51.99th	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)

CWE-328

CWE-916

References (5)

Link	Providers	Tags
https://github.com/advisories/GHSA-jxc4-w54c-qv5r		Advisory
https://github.com/mattermost/mattermost/commit/247cd1e51a8c943628dc650e87e794b06aad4c2b
https://github.com/mattermost/mattermost/commit/b74e85653660525d351d090a1e1874ae933bcbc8
https://mattermost.com/security-updates		x_refsource_CONFIRMVendor Advisory
https://nvd.nist.gov/vuln/detail/CVE-2017-18917