What is CVE-2018-0340?

CVE-2018-0340 is a medium-severity vulnerability in Cisco Unified Communications Manager, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2018-06-07.

How severe is CVE-2018-0340?

Medium severity. CVSS v3 base score is 5.4 out of 10.

XSS in Cisco Unified Communications Manager

CVE-2018-0340

A vulnerability in the web framework of the Cisco Unified Communications Manager (Unified CM) software could allow an authenticated, remote attacker to conduct a cross-site scripting (XSS) attack against the user of the web interface of the affected system. The vulnerability is due to insufficient input validation of certain parameters passed to the web server. An attacker could exploit this vulnerability by convincing the user to access a malicious link or by intercepting the user request and injecting certain malicious code. A successful exploit could allow the attacker to execute arbitrary script code in the context of the affected site or allow the attacker to access sensitive browser-based information. Cisco Bug IDs: CSCvj00512.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-06-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.013 (68.9th percentile), scored 2026-10-04.

Low probability of exploitation in the next 30 days, but still tracked. 69th percentile — 68.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.013 · newest: 0.013 · change: 0.000

Affected products

Cisco Unified Communications Manager — versions 12.0\(1.10000.10\), 10.5(2.10000.5), 10.5\(2.10000.5\)
Cisco Unified Communications Manager Unknown — versions Cisco Unified Communications Manager unknown

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180606… (Vendor Advisory)
www.securityfocus.com/bid/104448 (VDB Entry, Third Party Advisory, vdb-entry)
www.securitytracker.com/id/1041070 (VDB Entry, Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2018-0340?: CVE-2018-0340 is a medium-severity vulnerability in Cisco Unified Communications Manager, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2018-06-07.
How severe is CVE-2018-0340?: Medium severity. CVSS v3 base score is 5.4 out of 10.