CVE-2026-0483Network attack vector

Stored XSS via malicious PDF upload

Published Jan 28, 2026 · Updated Jan 28, 2026

Stored XSS in Live Helper Chat before 4.72 allows remote authenticated users to execute JavaScript by uploading a crafted PDF file. The PDF upload path stores attacker-controlled active content and serves it through an application-generated download link without neutralization. Exploitation requires a user to download and open the uploaded PDF, exposing data available in that user's local context.

CVSS severity6.9
Medium
EPSS probability0.26%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in Live Helper Chat before 4.72 allows remote authenticated users to execute JavaScript by uploading a crafted PDF file. The PDF upload path stores attacker-controlled active content and serves it through an application-generated download link without neutralization. Exploitation requires a user to download and open the uploaded PDF, exposing data available in that user's local context.

The record

CVE
CVE-2026-0483
Published
Jan 28, 2026
Updated
Jan 28, 2026
Vendor
Live Helper Chat
Product
Live Helper Chat
Classifications
CWE-79, T1204.002
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 28, 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 <4.72

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Live Helper Chat · Live Helper Chatversion=0 <4.72

Published CVSS scores

6.9INCIBE-CERTCVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:N/VA:N/SC:N/SI:N/SA: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')
T1204.002Malicious File

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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