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CVE-2025-13523

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

Published: Feb 6, 2026Updated: Feb 24, 2026 Sources: CVE List NVD GHSACWE-79
NVD MITRE
7.7CVSSHIGH
EPSS Score
0.2%
Top 91.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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

CVSS Vector Breakdown

AV:NAC:HPR:LUI:RS:CC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:HAttack Complexity
High
PR:LPrivileges Required
Low
UI:RUser Interaction
Required
Scope
S:CScope
Changed
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-79

Affected Products

confluencemattermost
On-prem
Communications / messaging-chat
Mattermost Confluence PluginMattermost
On-prem
Communications / messaging-chat
github.com/mattermost/mattermost-plugin-confluenceGoOSS Libraries
mattermostcommercialUSCommunications
gopackage-ecosystemOSS Libraries

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Execution
Initial Access
View detailed technique mapping

References

https://mattermost.com/security-updates
mattermost.com
https://nvd.nist.gov/vuln/detail/CVE-2025-13523
nvd.nist.gov
https://github.com/mattermost/mattermost-plugin-confluence
github.com

Timeline

Published
Feb 6, 2026
Last Updated
Feb 24, 2026

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