7.5

CVE-2017-18871: mattermost mattermost_server

CVSS: 7.5v3.1HighModified
AliasesGHSA-jc6w-8r7f-vmp5GO-2025-4184
Published 19-06-2020Last modified 05-08-2024
Open JSON

Vulnerability summary

CVE-2017-18871 is a high (CVSS 7.5) vulnerability in mattermost mattermost_server. EPSS estimates a 1.12% chance of exploitation in the next 30 days, higher than 65.7% of scored vulnerabilities.

Overall risk
30/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.5/10
010
High · v3.1 (NVD)
EPSS score
1.12%
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, 4.3.4, and 4.2.2. It allows attackers to cause a denial of service (application crash) via an @ character before a JavaScript field name.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.12%

Chance of exploitation in the next 30 days

Percentile

66%

Versus all other CVEs

30-day change

+0.01 pp

From 1.11% on 19-09-2026

19-09-202619-10-2026
EPSS score
1.12%

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

No weakness data has been published for this record.

Affected systems

Github.com/mattermost1 product
  • mattermost-server< 4.2.2 | ≥ 4.3.0-rc1, < 4.3.4 | ≥ 4.4.0-rc1, < 4.4.5 | ≥ 4.5.0-rc1, < 4.5.0 | ≥ 4.5.0-rc1+incompatible, < 4.5.0+incompatible
Mattermost1 product
  • mattermost_server< 4.2.2 | ≥ 4.3.0, < 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

5 links