CVE-2025-11829Network attack vectorHinoki check available

Contributor-level stored XSS via unescaped toolbar attribute

Published Nov 11, 2025 · Updated Nov 11, 2025

Stored XSS in Five9 Live Chat 1.1.2 and earlier allows remote authenticated users to execute scripts through the toolbar shortcode attribute. The [five9-chat] shortcode rendering path places the toolbar value into page output without sufficient input sanitization or contextual escaping. Contributor-level access is required to store the payload, which runs when a user opens the affected page and can act in that user's browser context.

CVSS severity6.4
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Stored XSS in Five9 Live Chat 1.1.2 and earlier allows remote authenticated users to execute scripts through the toolbar shortcode attribute. The [five9-chat] shortcode rendering path places the toolbar value into page output without sufficient input sanitization or contextual escaping. Contributor-level access is required to store the payload, which runs when a user opens the affected page and can act in that user's browser context.

The record

CVE
CVE-2025-11829
Published
Nov 11, 2025
Updated
Nov 11, 2025
Vendor
Five9
Product
Five9 Live Chat
Classifications
CWE-79, T1059.007
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Nov 11, 2025CVE publishedPublication date reported by the CVE source.
  2. Nov 11, 2025Record 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=* <=1.1.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Five9 · Five9 Live Chatversion=* <=1.1.2

Published CVSS scores

6.4WordfenceCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/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')
T1059.007JavaScript/JScript

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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