What is CVE-2018-18660?

CVE-2018-18660 is a medium-severity vulnerability in Arcserve Udp, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-10-26.

How severe is CVE-2018-18660?

Medium severity. CVSS v3 base score is 6.1 out of 10.

XSS in Arcserve Udp

CVE-2018-18660

An issue was discovered in Arcserve Unified Data Protection (UDP) through 6.5 Update 4. There is a DDI-VRT-2018-21 Reflected Cross-site Scripting via /authenticationendpoint/domain.jsp issue.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2018-10-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.009 (58.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Arcserve Udp — versions 6.5

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

support.arcserve.com/s/article/360001392563 (Patch, Vendor Advisory)
www.digitaldefense.com/blog/zero-day-alerts/arcserve-disclosure/ (Third Party Advisory)
support.arcserve.com/s/article/Security-vulnerabilities-with-Arcserve-UDP-and-f… (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2018-18660?: CVE-2018-18660 is a medium-severity vulnerability in Arcserve Udp, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2018-10-26.
How severe is CVE-2018-18660?: Medium severity. CVSS v3 base score is 6.1 out of 10.