4.3

CVE-2017-18870: mattermost mattermost_server

CVSS: 4.3v3.1MediumModified
AliasesGO-2025-4183GHSA-9j9j-mm2r-9rfm
Published 19-06-2020Last modified 05-08-2024
Open JSON

Vulnerability summary

CVE-2017-18870 is a medium (CVSS 4.3) vulnerability in mattermost mattermost_server. EPSS estimates a 0.62% chance of exploitation in the next 30 days, higher than 48.6% of scored vulnerabilities.

Overall risk
17/100
0100
Low · default modelHow is this calculated?
CVSS score
4.3/10
010
Medium · v3.1 (NVD)
EPSS score
0.62%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
OPENSUSE-SU-2026:21483-1SUSE-SU-2025:4395-1

Timeline

  1. 19-06-2020
    PublishedVulnerability first disclosed.
  2. 05-08-2024
    Last modifiedVulnerability information updated.

Description

An issue was discovered in Mattermost Server before 4.5.0, 4.4.5, and 4.3.4. It mishandled webhook access control in the EnableOnlyAdminIntegrations case.

CVSS metrics

2 scores · 1 source · 2 versions

EPSS trend

Probability

0.62%

Chance of exploitation in the next 30 days

Percentile

49%

Versus all other CVEs

30-day change

+0.01 pp

From 0.61% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.62%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Github.com/mattermost1 product
  • mattermost-serverAll versions (No fix recorded)
Mattermost1 product
  • mattermost_server< 4.3.4 | ≥ 4.4.0, < 4.4.5 | 4.5.0:rc1 | 4.5.0:rc2 | 4.5.0:rc3 | 4.5.0:rc4

2 vendors · 2 products

References

2 links