CVE-2025-13523Network attack vector

Cross-site scripting via unescaped OAuth display names

Published Feb 6, 2026 · Updated Feb 6, 2026

Cross-site scripting in Mattermost Confluence Plugin before 1.7.0 allows remote authenticated users to run JavaScript in victim browsers. The HTML template renderer inserts a Confluence display name into an OAuth connection link without escaping the user-controlled value. A victim must open the crafted link; successful execution can read or alter data available to that victim's browser session without interrupting service.

CVSS severity7.7
High
EPSS probability0.20%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Cross-site scripting in Mattermost Confluence Plugin before 1.7.0 allows remote authenticated users to run JavaScript in victim browsers. The HTML template renderer inserts a Confluence display name into an OAuth connection link without escaping the user-controlled value. A victim must open the crafted link; successful execution can read or alter data available to that victim's browser session without interrupting service.

The record

CVE
CVE-2025-13523
Published
Feb 6, 2026
Updated
Feb 6, 2026
Vendor
Mattermost
Product
Mattermost Confluence Plugin
Classifications
CWE-79, T1203
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 6, 2026CVE publishedPublication date reported by the CVE source.
  2. Feb 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <1.7.0

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Mattermost · Mattermost Confluence Pluginversion=0 <1.7.0

Published CVSS scores

5.4NVDCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
7.7MattermostCVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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