CVE-2017-18884 — Improper Privilege Management in Mattermost Mattermost-server

CWE-269 — Improper Privilege ManagementCWE-863 — Incorrect Authorization5 documents4 sources
Severity
8.1HIGHNVD
EPSS
0.2%
top 56.71%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Github.com Mattermost Mattermost-serverMattermost Server
Timeline
PublishedJun 19
Latest updateDec 8

Description

An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. It allows attackers to gain privileges by using a registered OAuth application with personal access tokens.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:NExploitability: 2.8 | Impact: 5.2

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 exposes OAuth personal access tokens to attackers in github.com/mattermost/mattermost-server↗2025-12-08
▶
OSV
Mattermost Server exposes OAuth personal access tokens to attackers↗2022-05-24
▶
GHSA
Mattermost Server exposes OAuth personal access tokens to attackers↗2022-05-24
▶
CVEList
CVE-2017-18884: An issue was discovered in Mattermost Server before 4↗2020-06-19
▶
CVE-2017-18884 — Improper Privilege Management | cvebase