Description
A vulnerability in the web UI of Cisco Desk Phone 9800 Series, Cisco IP Phone 7800 and 8800 Series, and Cisco Video Phone 8875 running Cisco SIP Software could allow an unauthenticated, remote attacker to conduct XSS attacks against a user of the web UI. This vulnerability exists because the web UI of an affected device does not sufficiently validate user-supplied input. An attacker could exploit this vulnerability by persuading a user to click a crafted link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected interface or access sensitive, browser-based information. Note: To exploit this vulnerability, the phone must be registered to Cisco Unified Communications Manager and have Web Access enabled. Web Access is disabled by default.
Affected products
cisco: desk phone 9871 firmware; cisco: desk phone 9871; cisco: desk phone 9841 firmware; cisco: desk phone 9841; cisco: desk phone 9851 firmware; cisco: desk phone 9851; cisco: desk phone 9861 firmware; cisco: desk phone 9861; cisco: ip phone 8865 firmware; cisco: ip phone 8865; cisco: ip phone 7811 firmware; cisco: ip phone 7811; cisco: ip phone 7821 firmware; cisco: ip phone 7821; cisco: ip phone 7841 firmware
References1
- sec.cloudapps.cisco.com/security/center/content/CiscoSecurityAd… Vendor Advisory
Metrics
- CVSS 3.1
-
6.1
MEDIUM
Score source: CNA
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N - EPSS — exploit probability
- 0% percentile: 21 · as of 9 November 2026
- CWE
- CWE-79
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