GitHub Advisoryadvisory · Go

GHSA-9x8x-w6g5-hx4w Mattermost Server is vulnerable to XSS attacks against an OAuth 2.0 allow/deny page

MEDIUM Published 2022-05-24 Modified 2025-12-05 Official page ↗
Aliases
CVE-2017-18877
Ecosystem
Go
Packages
github.com/mattermost/mattermost-server
Severity
Moderate
CVSS vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N
Weaknesses
CWE-79
Reviewed
2025-12-05

Affected packages

• Go github.com/mattermost/mattermost-server: < 4.1.2 → fixed in 4.1.2 • Go github.com/mattermost/mattermost-server: >= 4.2.0, < 4.2.1 → fixed in 4.2.1 • Go github.com/mattermost/mattermost-server: >= 4.3.0-rc1, < 4.3.0 → fixed in 4.3.0

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.

Related

Alias · CVE (1)

  • CVE-2017-18877 An issue was discovered in Mattermost Server before 4.3.0, 4.2.1, and 4.1.2. vulnerability

Weakness · CWE (1)

  • CWE-79 Improper Neutralization of Input During Web Page Generation weakness

References