CVE-2025-8349Network attack vector

Stored XSS via unsanitized PDF display

Published Oct 20, 2025 · Updated Oct 20, 2025

Stored cross-site scripting in all versions of tawk.to Live Chat allows remote attackers to run JavaScript in other users' browsers via malicious PDFs. The chatbot accepts a PDF containing a JavaScript payload, stores it, and later displays it to other users without properly sanitizing the embedded script. Exploitation requires another user to access the uploaded PDF, after which the script runs in that user's browser context and can read session data or perform actions as that user.

CVSS severity5.3
Medium
EPSS probability0.50%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored cross-site scripting in all versions of tawk.to Live Chat allows remote attackers to run JavaScript in other users' browsers via malicious PDFs. The chatbot accepts a PDF containing a JavaScript payload, stores it, and later displays it to other users without properly sanitizing the embedded script. Exploitation requires another user to access the uploaded PDF, after which the script runs in that user's browser context and can read session data or perform actions as that user.

The record

CVE
CVE-2025-8349
Published
Oct 20, 2025
Updated
Oct 20, 2025
Vendor
tawk.to
Product
Live Chat
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Oct 20, 2025CVE publishedPublication date reported by the CVE source.
  2. Oct 20, 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=All versions

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

tawk.to · Live Chatversion=All versions

Published CVSS scores

5.3INCIBECVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/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
Privilegesunauthenticated
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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