id: GO-2025-4189
modules:
    - module: github.com/mattermost/mattermost-server
      versions:
        - fixed: 4.1.2+incompatible
        - introduced: 4.2.0+incompatible
        - fixed: 4.2.1+incompatible
        - introduced: 4.3.0-rc1+incompatible
        - fixed: 4.3.0+incompatible
      vulnerable_at: 4.3.0-rc4+incompatible
summary: |-
    Mattermost Server is vulnerable to XSS through author_link field in Slack
    attachments in github.com/mattermost/mattermost-server
cves:
    - CVE-2017-18879
ghsas:
    - GHSA-498j-wxww-j897
references:
    - advisory: https://github.com/advisories/GHSA-498j-wxww-j897
    - advisory: https://nvd.nist.gov/vuln/detail/CVE-2017-18879
    - web: https://mattermost.com/security-updates
source:
    id: GHSA-498j-wxww-j897
    created: 2025-12-05T21:38:51.096698584Z
review_status: UNREVIEWED