GitHub Advisoryadvisory · Go

GHSA-498j-wxww-j897 Mattermost Server is vulnerable to XSS through author_link field in Slack attachments

MEDIUM Published 2022-05-24 Modified 2025-12-05 Official page ↗
Aliases
CVE-2017-18879
Ecosystem
Go
Packages
github.com/mattermost/mattermost-server
Severity
Moderate
CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A: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 could occur via the author_link field of a Slack attachment.

Related

Alias · CVE (1)

  • CVE-2017-18879 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