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CVE-2026-20233

MEDIUMCVSS 6.1/10EPSS 0.18%

Last modified

CVE-2026-20233 is a medium-severity vulnerability rated 6.1/10 on the CVSS scale. 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. Cisco has addressed this vulnerability in the Webex Meetings service, and no customer action is needed. This vulnerability existed because of insufficient validation of user input. EPSS estimates a 0.18% chance of exploitation in the next 30 days.

Description

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. Cisco has addressed this vulnerability in the Webex Meetings service, and no customer action is needed. This vulnerability existed because of insufficient validation of user input. Prior to this vulnerability being addressed, an attacker could have exploited this vulnerability by persuading a user to follow a malicious link. 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.

Metrics

CVSS 3.1
6.1/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

EPSS Probability
0.18%

8.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
CiscoWebex Meetings39.6.0
CiscoWebex Meetings39.7.0
CiscoWebex Meetings39.7.4
CiscoWebex Meetings39.7.7
CiscoWebex Meetings39.8.0
CiscoWebex Meetings39.8.2
CiscoWebex Meetings39.8.3
CiscoWebex Meetings39.8.4
CiscoWebex Meetings39.9.0
CiscoWebex Meetings39.9.1
CiscoWebex Meetings39.10.0
CiscoWebex Meetings39.11.0
CiscoWebex Meetings40.1.0
CiscoWebex Meetings40.2.0
CiscoWebex Meetings40.4.0
CiscoWebex Meetings40.4.10
CiscoWebex Meetings40.6.0
CiscoWebex Meetings40.6.2
CiscoWebex Meetings42.6.0
CiscoWebex Meetings42.7.0
CiscoWebex Meetings42.8.0
CiscoWebex Meetings42.9.0
CiscoWebex Meetings42.10.0
CiscoWebex Meetings42.11.0
CiscoWebex Meetings42.12.0
CiscoWebex Meetings43.1.0
CiscoWebex Meetings43.2.0
CiscoWebex Meetings43.3.0
CiscoWebex Meetings43.4.0
CiscoWebex Meetings43.4.1
CiscoWebex Meetings43.4.2
CiscoWebex Meetings43.5.0
CiscoWebex Meetings43.6.0
CiscoWebex Meetings43.6.1
CiscoWebex Meetings43.7.0
CiscoWebex Meetings43.8.0
CiscoWebex Meetings43.9.0
CiscoWebex Meetings43.10.0
CiscoWebex Meetings43.11.0
CiscoWebex Meetings43.12.0
CiscoWebex Meetings44.1.0
CiscoWebex Meetings44.2.0
CiscoWebex Meetings44.3.0
CiscoWebex Meetings44.4.0
CiscoWebex Meetings44.5.0
CiscoWebex Meetings44.6.0
CiscoWebex Meetings44.7.0
CiscoWebex Meetings44.8.0
CiscoWebex Meetings44.9.0
CiscoWebex Meetings44.10.0

Showing 50 of 56 affected configurations. See NVD for the full list.

References

Timeline

Published
Last Modified
Status
Analyzed

Frequently Asked Questions

What is CVE-2026-20233?
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. Cisco has addressed this vulnerability in the Webex Meetings service, and no customer action is needed. This vulnerability existed because of insufficient validation of user input. Prior to this vulnerability being addressed, an attacker could have exploited this vulnerability by persuading a user to follow a malicious link. 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.
How severe is CVE-2026-20233?
CVE-2026-20233 has a CVSS score of 6.1/10 (MEDIUM severity). The EPSS model estimates a 0.18% probability of exploitation in the next 30 days.
How do I fix CVE-2026-20233?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-20233?

Run a free Strix scan to check your systems for this vulnerability.

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Source: NVD / NIST