CVE-2017-18873 — Improper Input Validation in Mattermost Mattermost-server

CWE-20 — Improper Input Validation6 documents4 sources
Severity
5.3MEDIUMNVD
OSV5.5
EPSS
0.4%
top 40.65%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
3
Github.com Mattermost Mattermost-serverMattermost ServerJasper Project Jasper
Timeline
PublishedJun 19
Latest updateFeb 26

Description

An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. It allows attackers to cause a denial of service (channel invisibility) via a misformatted post.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:LExploitability: 3.9 | Impact: 1.4

Affected Packages3 packages

▶NVDmattermost/mattermost_server4.2.0 — 4.2.1+2
▶Gogithub.com/mattermost_mattermost-server4.2.0+incompatible — 4.2.1-0.20171013140502-b3e4b0ac9168+incompatible+5
▶Ubuntujasper_project/jasper< 1.900.1-debian1-2.4ubuntu1.3

🔴Vulnerability Details

5
OSV
Mattermost Server is vulnerable to channel invisibility DoS via misformatted post in github.com/mattermost/mattermost-server↗2026-02-26
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GHSA
Mattermost Server is vulnerable to channel invisibility DoS via misformatted post↗2022-05-24
▶
OSV
Mattermost Server is vulnerable to channel invisibility DoS via misformatted post↗2022-05-24
▶
OSV
jasper vulnerabilities↗2021-01-11
▶
CVEList
CVE-2017-18873: An issue was discovered in Mattermost Server before 4↗2020-06-19
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CVE-2017-18873 — Improper Input Validation | cvebase