CVE-2017-18877 — Cross-site Scripting in Mattermost Mattermost-server

CWE-79 — Cross-site Scripting5 documents4 sources
Severity
6.1MEDIUMNVD
EPSS
0.4%
top 41.86%
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. XSS attacks could occur against an OAuth 2.0 allow/deny page.

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NExploitability: 2.8 | Impact: 2.7

Affected Packages2 packages

▶NVDmattermost/mattermost_server4.1.0 — 4.1.2+2

🔴Vulnerability Details

4
OSV
Mattermost Server is vulnerable to XSS attacks against an OAuth 2.0 allow/deny page in github.com/mattermost/mattermost-server↗2025-12-08
▶
GHSA
Mattermost Server is vulnerable to XSS attacks against an OAuth 2.0 allow/deny page↗2022-05-24
▶
OSV
Mattermost Server is vulnerable to XSS attacks against an OAuth 2.0 allow/deny page↗2022-05-24
▶
CVEList
CVE-2017-18877: An issue was discovered in Mattermost Server before 4↗2020-06-19
▶
CVE-2017-18877 — Cross-site Scripting | cvebase