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Medium severity6.1NVD Advisory· Published Jun 3, 2026

CVE-2026-20233

CVE-2026-20233

Description

Cisco Webex Meetings has a stored XSS vulnerability due to insufficient input validation, allowing unauthenticated attackers to execute scripts in user browsers.

AI Insight

LLM-synthesized narrative grounded in this CVE's description and references.

Cisco Webex Meetings has a stored XSS vulnerability due to insufficient input validation, allowing unauthenticated attackers to execute scripts in user browsers.

Vulnerability

A vulnerability in the web-based user interface of Cisco Webex Meetings could have allowed an unauthenticated, remote attacker to conduct a cross-site scripting (XSS) attack. This vulnerability existed because of insufficient validation of user input. Cisco has addressed this vulnerability in the Webex Meetings service, which is cloud-based.

Exploitation

Prior to this vulnerability being addressed, an attacker could have exploited this vulnerability by persuading a user to follow a malicious link. No authentication was required for exploitation.

Impact

A successful exploit could have allowed the attacker to execute arbitrary script code in the browser of the targeted user or access sensitive, browser-based information.

Mitigation

Cisco has addressed this vulnerability in the Webex Meetings service, and no customer action is needed. There are no workarounds that address this vulnerability. Customers who need additional information are advised to contact the Cisco Technical Assistance Center (TAC) or their contracted maintenance providers [1].

References
  1. Cisco Security Advisory: Cisco Webex Meetings Cross-Site Scripting Vulnerability

AI Insight generated on Jun 3, 2026. Synthesized from this CVE's description and the cited reference URLs; citations are validated against the source bundle.

Affected products

1

Patches

0

No patches discovered yet.

Vulnerability mechanics

No source-code context for this CVE — mechanics is only generated when we can read the actual fix diff. Without that, the four sections (root cause, attack vector, affected code, fix) would be speculation rather than analysis.

References

1

News mentions

1