Browser script execution via insufficient input validation
Published Jun 3, 2026 · Updated Jun 3, 2026
Cross-site scripting in Cisco Webex Meetings allows remote attackers to execute script in a user’s browser through a malicious link. The web interface insufficiently validates user input before browser processing; Cisco has not disclosed the affected endpoint, parameter, or rendering operation. Exploitation requires a targeted user to follow the crafted link, after which script runs in that user’s browser context and can read sensitive browser-based information.
Summary
What happened
Cross-site scripting in Cisco Webex Meetings allows remote attackers to execute script in a user’s browser through a malicious link. The web interface insufficiently validates user input before browser processing; Cisco has not disclosed the affected endpoint, parameter, or rendering operation. Exploitation requires a targeted user to follow the crafted link, after which script runs in that user’s browser context and can read sensitive browser-based information.
The record
- CVE
- CVE-2026-20233
- Published
- Jun 3, 2026
- Updated
- Jun 3, 2026
- Vendor
- ClamAV
- Product
- Webex Meetings
- Classifications
- CWE-79, T1203
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jun 3, 2026CVE publishedPublication date reported by the CVE source.
- Jun 3, 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.
- Affected versionversion=39.10
- Affected versionversion=39.11
- Affected versionversion=39.6
- Affected versionversion=39.7
- Affected versionversion=39.7.4
- Affected versionversion=39.7.7
- Affected versionversion=39.8
- Affected versionversion=39.8.2
- Affected versionversion=39.8.3
- Affected versionversion=39.8.4
- Affected versionversion=39.9
- Affected versionversion=39.9.1
- Affected versionversion=40.1
- Affected versionversion=40.2
- Affected versionversion=40.4
- Affected versionversion=40.4.10
- Affected versionversion=40.6
- Affected versionversion=40.6.2
- Affected versionversion=42.10
- Affected versionversion=42.11
- Affected versionversion=42.12
- Affected versionversion=42.6
- Affected versionversion=42.7
- Affected versionversion=42.8
- Affected versionversion=42.9
- Affected versionversion=43.1
- Affected versionversion=43.10
- Affected versionversion=43.11
- Affected versionversion=43.12
- Affected versionversion=43.2
- Affected versionversion=43.3
- Affected versionversion=43.4
- Affected versionversion=43.4.1
- Affected versionversion=43.4.2
- Affected versionversion=43.5.0
- Affected versionversion=43.6.0
- Affected versionversion=43.6.1
- Affected versionversion=43.7
- Affected versionversion=43.8
- Affected versionversion=43.9
- Affected versionversion=44.1
- Affected versionversion=44.10
- Affected versionversion=44.11
- Affected versionversion=44.12
- Affected versionversion=44.2
- Affected versionversion=44.3
- Affected versionversion=44.4
- Affected versionversion=44.5
- Affected versionversion=44.6
- Affected versionversion=44.7
- Affected versionversion=44.8
- Affected versionversion=44.9
- Affected versionversion=45.1
- Affected versionversion=45.2
- Affected versionversion=45.3
- Affected versionversion=45.4
What conditions does exploitation require?
What is affected?
Published CVSS scores
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.
Weakness, pattern, technique
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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