CVE-2025-13523
Cross-Site Scripting in Mattermost Confluence Plugin
Publication date: 2026-02-06
Last updated on: 2026-02-24
Assigner: Mattermost, Inc.
Description
Description
CVSS Scores
EPSS Scores
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Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| mattermost | confluence | From 1.0.0 (inc) to 1.7.0 (exc) |
Helpful Resources
Exploitability
| CWE ID | Description |
|---|---|
| CWE-79 | The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. |
Attack-Flow Graph
AI Powered Q&A
What immediate steps should I take to mitigate this vulnerability?
I don't know
Can you explain this vulnerability to me?
This vulnerability exists in the Mattermost Confluence plugin versions prior to 1.7.0. It occurs because the plugin fails to properly escape user-controlled display names when rendering HTML templates. As a result, an authenticated Confluence user who sets a malicious display name can craft a specially designed OAuth2 connection link. When a victim visits this link, the attacker's display name is rendered without proper sanitization, allowing the execution of arbitrary JavaScript in the victim's browser.
How can this vulnerability impact me? :
The vulnerability can lead to cross-site scripting (XSS) attacks, where arbitrary JavaScript code is executed in the context of the victim's browser. This can result in theft of sensitive information, session hijacking, or performing actions on behalf of the victim without their consent. Since the attack requires an authenticated Confluence user to craft the malicious display name and link, the risk is limited to users who interact with such links.
How does this vulnerability affect compliance with common standards and regulations (like GDPR, HIPAA)?:
I don't know
How can this vulnerability be detected on my network or system? Can you suggest some commands?
I don't know