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CVE-2026-20233

29
FAUCET Score

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.

First published: Jun 3, 2026Last modified: Jun 3, 2026

Impacted Technologies

VendorProductVersion(s)CPE
39.9.0CPE matchmatch criteria
cpe:2.3:a:cisco:webex_meetings:39.9.0:*:*:*:*:*:*:*
39.9.1CPE matchmatch criteria
cpe:2.3:a:cisco:webex_meetings:39.9.1:*:*:*:*:*:*:*
39.10.0CPE matchmatch criteria
cpe:2.3:a:cisco:webex_meetings:39.10.0:*:*:*:*:*:*:*
39.11.0CPE matchmatch criteria
cpe:2.3:a:cisco:webex_meetings:39.11.0:*:*:*:*:*:*:*
40.1.0CPE matchmatch criteria
cpe:2.3:a:cisco:webex_meetings:40.1.0:*:*:*:*:*:*:*

CVSS Data

CVSS version used by this source: 3.1

6.1MEDIUM

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
REQUIRED
Scope
CHANGED
Confidentiality Impact
LOW
Integrity Impact
LOW
Availability Impact
NONE
Exploitability Score
2.8
Impact Score
2.7
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.18%
Probability of exploitation in next 30 days
EPSS Percentile
8.3%
Percentile rank of EPSS score among Peer Group
As of 2026-07-28
Model: v2026.06.15
This CVE's current EPSS score of 0.0018 is in the 7th percentile among its peer group of 26,236 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.

Media Mentions

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Vendor Patches (1)

ciscovendor investigatingvia nvd_reference
View patch

References

sec.cloudapps.cisco.com / security/center/content/CiscoSecurityAdvisory/cisco-sa-webex-xss-jw3NeQzS
Vendor Advisory