CVE-2026-20233 | Cisco Webex Meetings Cross-Site Scripting 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. 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.

Published: 2026-06-03 Last update: 2026-06-17 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-20233 is rated Low Risk (27.4/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.18%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-20233

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 0.02% 0.18% +0.16%
2 2026-06-04 — 0.02% —

Full EPSS history (2 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-20233

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
6.1 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:C)
Breaking this can reach past the original component and bite other resources—bigger blast radius.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:L)
Attackers could change some data, but it’s limited—not everything goes.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 2.7 [email protected]

Weakness enumeration for CVE-2026-20233

GitHub Security Advisory for CVE-2026-20233

GHSA-474g-pxq3-xp9q · Severity: medium — A vulnerability in the web-based user interface of Cisco Webex Meetings could have allowed an...

Affected software / configurations for CVE-2026-20233

Vendor Product Version Raw CPE
cisco webex_meetings 39.6.0 cpe:2.3:a:cisco:webex_meetings:39.6.0:*:*:*:*:*:*:*
cisco webex_meetings 39.7.0 cpe:2.3:a:cisco:webex_meetings:39.7.0:*:*:*:*:*:*:*
cisco webex_meetings 39.7.4 cpe:2.3:a:cisco:webex_meetings:39.7.4:*:*:*:*:*:*:*
cisco webex_meetings 39.7.7 cpe:2.3:a:cisco:webex_meetings:39.7.7:*:*:*:*:*:*:*
cisco webex_meetings 39.8.0 cpe:2.3:a:cisco:webex_meetings:39.8.0:*:*:*:*:*:*:*
cisco webex_meetings 39.8.2 cpe:2.3:a:cisco:webex_meetings:39.8.2:*:*:*:*:*:*:*
cisco webex_meetings 39.8.3 cpe:2.3:a:cisco:webex_meetings:39.8.3:*:*:*:*:*:*:*
cisco webex_meetings 39.8.4 cpe:2.3:a:cisco:webex_meetings:39.8.4:*:*:*:*:*:*:*
cisco webex_meetings 39.9.0 cpe:2.3:a:cisco:webex_meetings:39.9.0:*:*:*:*:*:*:*
cisco webex_meetings 39.9.1 cpe:2.3:a:cisco:webex_meetings:39.9.1:*:*:*:*:*:*:*
cisco webex_meetings 39.10.0 cpe:2.3:a:cisco:webex_meetings:39.10.0:*:*:*:*:*:*:*
cisco webex_meetings 39.11.0 cpe:2.3:a:cisco:webex_meetings:39.11.0:*:*:*:*:*:*:*
cisco webex_meetings 40.1.0 cpe:2.3:a:cisco:webex_meetings:40.1.0:*:*:*:*:*:*:*
cisco webex_meetings 40.2.0 cpe:2.3:a:cisco:webex_meetings:40.2.0:*:*:*:*:*:*:*
cisco webex_meetings 40.4.0 cpe:2.3:a:cisco:webex_meetings:40.4.0:*:*:*:*:*:*:*
cisco webex_meetings 40.4.10 cpe:2.3:a:cisco:webex_meetings:40.4.10:*:*:*:*:*:*:*
cisco webex_meetings 40.6.0 cpe:2.3:a:cisco:webex_meetings:40.6.0:*:*:*:*:*:*:*
cisco webex_meetings 40.6.2 cpe:2.3:a:cisco:webex_meetings:40.6.2:*:*:*:*:*:*:*
cisco webex_meetings 42.6.0 cpe:2.3:a:cisco:webex_meetings:42.6.0:*:*:*:*:*:*:*
cisco webex_meetings 42.7.0 cpe:2.3:a:cisco:webex_meetings:42.7.0:*:*:*:*:*:*:*
cisco webex_meetings 42.8.0 cpe:2.3:a:cisco:webex_meetings:42.8.0:*:*:*:*:*:*:*
cisco webex_meetings 42.9.0 cpe:2.3:a:cisco:webex_meetings:42.9.0:*:*:*:*:*:*:*
cisco webex_meetings 42.10.0 cpe:2.3:a:cisco:webex_meetings:42.10.0:*:*:*:*:*:*:*
cisco webex_meetings 42.11.0 cpe:2.3:a:cisco:webex_meetings:42.11.0:*:*:*:*:*:*:*
cisco webex_meetings 42.12.0 cpe:2.3:a:cisco:webex_meetings:42.12.0:*:*:*:*:*:*:*
cisco webex_meetings 43.1.0 cpe:2.3:a:cisco:webex_meetings:43.1.0:*:*:*:*:*:*:*
cisco webex_meetings 43.2.0 cpe:2.3:a:cisco:webex_meetings:43.2.0:*:*:*:*:*:*:*
cisco webex_meetings 43.3.0 cpe:2.3:a:cisco:webex_meetings:43.3.0:*:*:*:*:*:*:*
cisco webex_meetings 43.4.0 cpe:2.3:a:cisco:webex_meetings:43.4.0:*:*:*:*:*:*:*
cisco webex_meetings 43.4.1 cpe:2.3:a:cisco:webex_meetings:43.4.1:*:*:*:*:*:*:*
cisco webex_meetings 43.4.2 cpe:2.3:a:cisco:webex_meetings:43.4.2:*:*:*:*:*:*:*
cisco webex_meetings 43.5.0 cpe:2.3:a:cisco:webex_meetings:43.5.0:*:*:*:*:*:*:*
cisco webex_meetings 43.6.0 cpe:2.3:a:cisco:webex_meetings:43.6.0:*:*:*:*:*:*:*
cisco webex_meetings 43.6.1 cpe:2.3:a:cisco:webex_meetings:43.6.1:*:*:*:*:*:*:*
cisco webex_meetings 43.7.0 cpe:2.3:a:cisco:webex_meetings:43.7.0:*:*:*:*:*:*:*
cisco webex_meetings 43.8.0 cpe:2.3:a:cisco:webex_meetings:43.8.0:*:*:*:*:*:*:*
cisco webex_meetings 43.9.0 cpe:2.3:a:cisco:webex_meetings:43.9.0:*:*:*:*:*:*:*
cisco webex_meetings 43.10.0 cpe:2.3:a:cisco:webex_meetings:43.10.0:*:*:*:*:*:*:*
cisco webex_meetings 43.11.0 cpe:2.3:a:cisco:webex_meetings:43.11.0:*:*:*:*:*:*:*
cisco webex_meetings 43.12.0 cpe:2.3:a:cisco:webex_meetings:43.12.0:*:*:*:*:*:*:*
cisco webex_meetings 44.1.0 cpe:2.3:a:cisco:webex_meetings:44.1.0:*:*:*:*:*:*:*
cisco webex_meetings 44.2.0 cpe:2.3:a:cisco:webex_meetings:44.2.0:*:*:*:*:*:*:*
cisco webex_meetings 44.3.0 cpe:2.3:a:cisco:webex_meetings:44.3.0:*:*:*:*:*:*:*
cisco webex_meetings 44.4.0 cpe:2.3:a:cisco:webex_meetings:44.4.0:*:*:*:*:*:*:*
cisco webex_meetings 44.5.0 cpe:2.3:a:cisco:webex_meetings:44.5.0:*:*:*:*:*:*:*
cisco webex_meetings 44.6.0 cpe:2.3:a:cisco:webex_meetings:44.6.0:*:*:*:*:*:*:*
cisco webex_meetings 44.7.0 cpe:2.3:a:cisco:webex_meetings:44.7.0:*:*:*:*:*:*:*
cisco webex_meetings 44.8.0 cpe:2.3:a:cisco:webex_meetings:44.8.0:*:*:*:*:*:*:*
cisco webex_meetings 44.9.0 cpe:2.3:a:cisco:webex_meetings:44.9.0:*:*:*:*:*:*:*
cisco webex_meetings 44.10.0 cpe:2.3:a:cisco:webex_meetings:44.10.0:*:*:*:*:*:*:*
cisco webex_meetings 44.11.0 cpe:2.3:a:cisco:webex_meetings:44.11.0:*:*:*:*:*:*:*
cisco webex_meetings 44.12.0 cpe:2.3:a:cisco:webex_meetings:44.12.0:*:*:*:*:*:*:*
cisco webex_meetings 45.1.0 cpe:2.3:a:cisco:webex_meetings:45.1.0:*:*:*:*:*:*:*
cisco webex_meetings 45.2.0 cpe:2.3:a:cisco:webex_meetings:45.2.0:*:*:*:*:*:*:*
cisco webex_meetings 45.3.0 cpe:2.3:a:cisco:webex_meetings:45.3.0:*:*:*:*:*:*:*
cisco webex_meetings 45.4.0 cpe:2.3:a:cisco:webex_meetings:45.4.0:*:*:*:*:*:*:*

References for CVE-2026-20233

cvelogic Threat Intelligence