What is CVE-2016-1566?

CVE-2016-1566 is a medium-severity vulnerability in Apache Guacamole, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2017-02-02.

How severe is CVE-2016-1566?

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

XSS in Apache Guacamole

CVE-2016-1566

Cross-site scripting (XSS) vulnerability in the file browser in Guacamole 0.9.8 and 0.9.9, when file transfer is enabled to a location shared by multiple users, allows remote authenticated users to inject arbitrary web script or HTML via a crafted filename. NOTE: this vulnerability was fixed in guacamole.war on 2016-01-13, but the version number was not changed.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2017-02-02 · 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: 0.022 (82.0th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 82.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.022 · newest: 0.022 · change: 0.000

Affected products

Apache Guacamole — versions 0.9.8, 0.9.9

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

sourceforge.net/p/guacamole/news/2016/02/security-advisory---stored-xss-cve-201… (Third Party Advisory)

Frequently asked questions

What is CVE-2016-1566?: CVE-2016-1566 is a medium-severity vulnerability in Apache Guacamole, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2017-02-02.
How severe is CVE-2016-1566?: Medium severity. CVSS v3 base score is 5.4 out of 10.