What is CVE-2019-16991?

CVE-2019-16991 is a medium-severity vulnerability in Fusionpbx, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-10-21.

How severe is CVE-2019-16991?

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

XSS in Fusionpbx

CVE-2019-16991

In FusionPBX up to v4.5.7, the file app\edit\filedelete.php uses an unsanitized "file" variable coming from the URL, which is reflected in HTML, leading to XSS.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-10-21 · 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: 0.008 (55.0th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 55.0% 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

Fusionpbx

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/fusionpbx/fusionpbx/commit/cd4632b46c62855f7e1c1c93d20ffd64edcb476e (Patch)
resp3ctblog.wordpress.com/2019/10/19/fusionpbx-xss-20/ (Third Party Advisory)

Frequently asked questions

What is CVE-2019-16991?: CVE-2019-16991 is a medium-severity vulnerability in Fusionpbx, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-10-21.
How severe is CVE-2019-16991?: Medium severity. CVSS v3 base score is 6.1 out of 10.