CVE-2025-13523

HIGH

Mattermost Confluence Plugin < 1.7.0 - Authenticated Stored Cross-Site Scripting via OAuth2 Connection Link

Title source: llm
STIX 2.1

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

References (1)

Core 1
Core References
Various Sources vendor-advisory
https://mattermost.com/security-updates

Scores

CVSS v3 7.7
EPSS 0.0001
EPSS Percentile 3.1%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-79
Status published
Products (2)
mattermost/confluence 1.0.0 - 1.7.0
mattermost/mattermost-plugin-confluence 0 - 1.7.0Go
Published Feb 06, 2026
Tracked Since Feb 18, 2026