5.3

CVE-2017-18898: mattermost mattermost_server Improper Resource Shutdown or Release

Modified
AliasesGHSA-9589-mq83-f749GO-2026-4300
Published 19-06-2020Last modified 05-08-2024

Vulnerability summary

CVE-2017-18898 is a medium (CVSS 5.3) Improper Resource Shutdown or Release vulnerability in mattermost mattermost_server. EPSS estimates a 1.11% chance of exploitation in the next 30 days, higher than 65.5% of scored vulnerabilities.

Overall risk
21/100
0100
Low · default modelHow is this calculated?
CVSS score
5.3/10
010
Medium · v3.1 (NVD)
EPSS score
1.11%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 2 · Related 2
OPENSUSE-SU-2026:21483-1SUSE-SU-2026:0142-1

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 4.2.0, 4.1.1, and 4.0.5. It allows crafted posts that potentially cause a web browser to hang.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

1.11%

Chance of exploitation in the next 30 days

Percentile

66%

Versus all other CVEs

30-day change

Increase +0.01 pp

From 1.10% on 22-09-2026

22-09-202622-10-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Github.com/mattermost1 product
  • mattermost-server< 4.0.5 | ≥ 4.1.0, < 4.1.1 | ≥ 4.2.0-rc1, < 4.2.0 | ≥ 4.2.0-rc1+incompatible, < 4.2.0+incompatible
Mattermost1 product
  • mattermost_server< 4.0.5 | ≥ 4.1.0, < 4.1.1 | 4.2.0:rc1 | 4.2.0:rc2 | 4.2.0:rc3 | 4.2.0:rc4

2 vendors · 2 products

References

8 links