CVE-2017-18890 — Improper Input Validation in Mattermost Mattermost-server

CWE-20 — Improper Input Validation5 documents4 sources
Severity
4.3MEDIUMNVD
EPSS
0.3%
top 51.11%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Github.com Mattermost Mattermost-serverMattermost Server
Timeline
PublishedJun 19
Latest updateDec 15

Description

An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. It allows an attacker to create a button that, when pressed by a user, launches an API request.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:NExploitability: 2.8 | Impact: 1.4

Affected Packages2 packages

▶NVDmattermost/mattermost_server4.2.0 — 4.2.1+2
▶Gogithub.com/mattermost_mattermost-server4.2.0-rc1 — 4.2.1+5

🔴Vulnerability Details

4
OSV
Mattermost Server allows attackers to create buttons that can launch API requests in github.com/mattermost/mattermost-server↗2025-12-15
▶
GHSA
Mattermost Server allows attackers to create buttons that can launch API requests↗2022-05-24
▶
OSV
Mattermost Server allows attackers to create buttons that can launch API requests↗2022-05-24
▶
CVEList
CVE-2017-18890: An issue was discovered in Mattermost Server before 4↗2020-06-19
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CVE-2017-18890 — Improper Input Validation | cvebase