CVE-2025-13523

HIGH7.7EPSS 0.01%

Mattermost Confluence plugin doesn't properly escape user-controlled display names in HTML template rendering

Published: 2/6/2026Modified: 2/22/2026

Also known as:GHSA-ffx7-34p2-vm3wGO-2026-4456

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

Affected packages (2)

Go/github.com/mattermost/mattermost-plugin-confluencefrom 0, < 1.7.0
Go/github.com/mattermost/mattermost-plugin-confluencefrom 0, < 1.7.0

CVSS scores

Source	Version	Severity	Vector
osv	CVSS 3.1	HIGH7.7	CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N

References (4)

ADVISORYhttps://github.com/advisories/GHSA-ffx7-34p2-vm3w
ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2025-13523
PATCHhttps://github.com/mattermost/mattermost-plugin-confluence
WEBhttps://mattermost.com/security-updates