How severe is CVE-2026-20233?

CVE-2026-20233 has a CVSS 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.

Is CVE-2026-20233 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-20233?

CVE-2026-20233 primarily affects Cisco Webex Meetings. In total, 56 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.

How do I fix CVE-2026-20233?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-20233 have an EU (EUVD) identifier?

Yes. CVE-2026-20233 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34135.

When was CVE-2026-20233 published?

CVE-2026-20233 was published on 2026-06-03 and last updated on 2026-06-17.

CVE-2026-20233

CVE-2026-20233 is a medium-severity vulnerability in Cisco Webex Meetings with a CVSS 3.x base score of 6.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-79.

Key facts

Severity: Medium (CVSS 3.x base score 6.1)
EPSS exploit prediction: 0% (8th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-34135
Weakness: CWE-79
Affected product: Cisco Webex Meetings
Published: 2026-06-03
Last modified: 2026-06-17

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.

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 3.x base score of 6.1, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and user interaction. Impact on confidentiality is low, integrity low, and availability none.
Is CVE-2026-20233 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (8th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-20233?: CVE-2026-20233 primarily affects Cisco Webex Meetings. In total, 56 product configurations (CPEs) are listed as vulnerable; see the affected-products list for the exact versions.
How do I fix CVE-2026-20233?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-20233 have an EU (EUVD) identifier?: Yes. CVE-2026-20233 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-34135.
When was CVE-2026-20233 published?: CVE-2026-20233 was published on 2026-06-03 and last updated on 2026-06-17.

References

https://sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-xss-jw3NeQzS

Affected products (56)

cpe:2.3:a:cisco:webex_meetings:39.6.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:39.7.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:39.7.4:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:39.7.7:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:39.8.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:39.8.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:39.8.3:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:39.8.4:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:39.9.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:39.9.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:39.10.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:39.11.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:40.1.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:40.2.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:40.4.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:40.4.10:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:40.6.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:40.6.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:42.6.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:42.7.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:42.8.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:42.9.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:42.10.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:42.11.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:42.12.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:43.1.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:43.2.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:43.3.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:43.4.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:43.4.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:43.4.2:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:43.5.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:43.6.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:43.6.1:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:43.7.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:43.8.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:43.9.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:43.10.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:43.11.0:*:*:*:*:*:*:*
cpe:2.3:a:cisco:webex_meetings:43.12.0:*:*:*:*:*:*:*

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