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Description

Mattermost Confluence plugin version <1.7.0 fails to properly escape user-controlled display names in HTML template rendering which allows authenticated Confluence users with malicious display names to execute arbitrary JavaScript in victim browsers via sending a specially crafted OAuth2 connection link that, when visited, renders the attacker's display name without proper sanitization. Mattermost Advisory ID: MMSA-2025-00557

PUBLISHED Reserved 2025-11-21 | Published 2026-02-06 | Updated 2026-02-06 | Assigner Mattermost




HIGH: 7.7CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N

Problem types

CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')

Product status

Default status
unaffected

Any version before 1.7.0
affected

1.7.0
unaffected

Credits

daw10 finder

References

mattermost.com/security-updates (MMSA-2025-00557) vendor-advisory

cve.org (CVE-2025-13523)

nvd.nist.gov (CVE-2025-13523)

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