CVE-2025-13523

Cross-Site Scripting (XSS) via Unescaped Display Names in Mattermost Confluence Plugin OAuth2 Flow

Published Feb 6, 2026 CVSS 3.1 · 7.7 High EPSS < 1% KEV · Not listed
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

Remediation

Vendor Solution

Update Mattermost Confluence plugin to versions 1.7.0 or higher.

Tracking

Sign in to view the affected projects.

Advisories

Source ID Title
Github GHSA Github GHSA GHSA-ffx7-34p2-vm3w Mattermost Confluence plugin doesn't properly escape user-controlled display names in HTML template rendering
References
History
Type Values Removed Values Added
CPEs cpe:2.3:a:mattermost:confluence:*:*:*:*:*:mattermost:*:*
Type Values Removed Values Added
First Time appeared Mattermost
Mattermost confluence
Vendors & Products Mattermost
Mattermost confluence
Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'no', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Type Values Removed Values Added
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
Title Cross-Site Scripting (XSS) via Unescaped Display Names in Mattermost Confluence Plugin OAuth2 Flow
Weaknesses CWE-79
References
Metrics cvssV3_1

{'score': 7.7, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
Mattermost
Published
Updated
Feb 6, 2026, 4:23 PM
Reserved
Nov 21, 2025, 7:29 PM
Status
Analyzed
Published
Feb 6, 2026, 4:16 PM
Modified
Jun 17, 2026, 8:34 AM