CVE-2025-13523
High
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
SeverityHigh
CVSS7.7
Exploit probability—
Product
Mattermost Confluence
PublishedFeb 6, 2026
First seenFeb 6, 2026
Weakness typeCWE-79Cross-site scripting (XSS)
How to fix
Update
- mattermost confluence1.7.0 or later
- github.com/mattermost/mattermost-plugin-confluence1.7.0 or later
Vendor advisories
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mattermost confluence | 1.0.0 ≤ v < 1.7.0 | 1.7.0 |
| github.com/mattermost/mattermost-plugin-confluenceGo | v < 1.7.0 | 1.7.0 |
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