CVE-2022-20778Network attack vector

Browser script execution via unvalidated authentication input

Published Apr 21, 2022 · Updated Nov 6, 2024

Cross-site scripting in the authentication component of Cisco Webex Meetings allows remote attackers to execute script code via a crafted link. The authentication interface insufficiently validates user-supplied input, allowing the link to supply script content to the affected page. No account is required, but a user must click the link; successful execution runs in the interface context and exposes browser-based information or alters page content.

CVSS severity6.1
Medium
EPSS probability0.82%
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 the authentication component of Cisco Webex Meetings allows remote attackers to execute script code via a crafted link. The authentication interface insufficiently validates user-supplied input, allowing the link to supply script content to the affected page. No account is required, but a user must click the link; successful execution runs in the interface context and exposes browser-based information or alters page content.

The record

CVE
CVE-2022-20778
Published
Apr 21, 2022
Updated
Nov 6, 2024
Vendor
ClamAV
Product
Webex Meetings
Classifications
CWE-79, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 21, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 6, 2024Record 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 Meetingsversion=n/a

Published CVSS scores

4.3NIST NVDAV:N/AC:M/Au:N/C:N/I:P/A:N
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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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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