Cisco WebEx: Mehrere Schwachstellen
WID-SEC-2026-1132 · first 16.04.2026 · updated 16.04.2026 · CVSS 9,8
What it is about
Der WebEx Meeting Service ist ein Multimedia Konferenz System von Cisco. Ein Angreifer kann mehrere Schwachstellen in Cisco WebEx ausnutzen, um einen Cross-Site Scripting Angriff durchzuführen und um Sicherheitsvorkehrungen zu umgehen.
Under what conditions?
The BSI does not name any particular preconditions. Exploitable remotely according to the BSI.
What can happen in the worst case
An attacker could use the vulnerability to
- einen Cross-Site Scripting Angriff durchzuführen
- Sicherheitsvorkehrungen zu umgehen
Am I affected?
Affected according to the BSI:
- Cisco WebEx Contact Center
- Cisco WebEx Services
The installed version is usually shown under “Help → About” or in the device’s admin interface.
What helps?
Install the updates provided by the vendor; details in the sources below.
Is the vulnerability already being exploited?
None of the CVEs is in the CISA catalogue of exploited vulnerabilities. That does not mean there are no attacks, only that none are documented.
Information and sources
- Original BSI advisory (WID)
- Cisco Security Advisory cisco-sa-webexcc-xss-WEX5nUnA vom 2026-04-15 sec.cloudapps.cisco.com
- Cisco Security Advisory cisco-sa-webex-cui-cert-8jSZYhWL vom 2026-04-15 sec.cloudapps.cisco.com
CVE: CVE-2026-20170, CVE-2026-20184
Source: BSI warning and information service (CERT-Bund); CISA. The assessment of the conditions is my reading of the BSI text; the external pages are in their original language.