What is CVE-2016-5663?

CVE-2016-5663 is a medium-severity vulnerability in Accellion Kiteworks Appliance, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2016-08-26.

How severe is CVE-2016-5663?

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

XSS in Accellion Kiteworks Appliance

CVE-2016-5663

Multiple cross-site scripting (XSS) vulnerabilities in oauth_callback.php on Accellion Kiteworks appliances before kw2016.03.00 allow remote attackers to inject arbitrary web script or HTML via the (1) code, (2) error, or (3) error_description parameter.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2016-08-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 6.1 (Medium). Vector: CVSS:3.0/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

Accellion Kiteworks Appliance

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

www.kb.cert.org/vuls/id/305607 (US Government Resource, Third Party Advisory, third-party-advisory)
www.securityfocus.com/bid/92662 (vdb-entry)

Frequently asked questions

What is CVE-2016-5663?: CVE-2016-5663 is a medium-severity vulnerability in Accellion Kiteworks Appliance, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2016-08-26.
How severe is CVE-2016-5663?: Medium severity. CVSS v3 base score is 6.1 out of 10.