What is CVE-2018-0208?

CVE-2018-0208 is a medium-severity vulnerability in Cisco Email Encryption, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2018-03-08.

How severe is CVE-2018-0208?

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

Is CVE-2018-0208 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Cisco Email Encryption

CVE-2018-0208

A vulnerability in the web-based management interface of the (cloud based) Cisco Registered Envelope Service could allow an authenticated, remote attacker to conduct a cross-site scripting (XSS) attack against a user of the web-based management interface of the affected service. The vulnerability is due to insufficient validation of user-supplied input that is processed by the web-based management interface of the affected service. An attacker could exploit this vulnerability by persuading a user of the interface to click a malicious link. A successful exploit could allow the attacker to execute arbitrary script code in the context of the interface or access sensitive browser-based information. Cisco Bug IDs: CSCvg74126.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-03-08 · 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: 0.008 (54.6th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Cisco Email Encryption — versions 5.3.0
Cisco Registered Envelope Service — versions Cisco Registered Envelope Service

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

www.securityfocus.com/bid/103337 (VDB Entry, Third Party Advisory, vdb-entry)
tools.cisco.com/security/center/content/CiscoSecurityAdvisory/cisco-sa-20180307… (Vendor Advisory)

Frequently asked questions

What is CVE-2018-0208?: CVE-2018-0208 is a medium-severity vulnerability in Cisco Email Encryption, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2018-03-08.
How severe is CVE-2018-0208?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2018-0208 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.