CVE-2026-20170Network attack vector

Browser data theft via improper script handling

Published Apr 15, 2026 · Updated Apr 15, 2026

Cross-site scripting in Cisco Webex Contact Center Desktop Agent allows remote attackers to steal browser data through a malicious link. The cloud service improperly handled HTML and script content supplied to the Desktop Agent, allowing that content to execute in a user's browser. Exploitation required persuading a user to follow the link and exposed authentication and session information, with no service interruption reported.

CVSS severity6.1
Medium
EPSS probability0.22%
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 Cisco Webex Contact Center Desktop Agent allows remote attackers to steal browser data through a malicious link. The cloud service improperly handled HTML and script content supplied to the Desktop Agent, allowing that content to execute in a user's browser. Exploitation required persuading a user to follow the link and exposed authentication and session information, with no service interruption reported.

The record

CVE
CVE-2026-20170
Published
Apr 15, 2026
Updated
Apr 15, 2026
Vendor
ClamAV
Product
Webex Contact Center
Classifications
CWE-80, T1539
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 15, 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=N/A

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ClamAV · Webex Contact Centerversion=N/A

Published CVSS scores

6.1Cisco Systems, Inc.CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N/E:X/RL:X/RC:X

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-80Improper Neutralization of Script-Related HTML Tags in a Web Page (Basic XSS)
T1539Steal Web Session Cookie

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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