What is CVE-2019-16975?

CVE-2019-16975 is a medium-severity vulnerability in Fusionpbx, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-10-23.

How severe is CVE-2019-16975?

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

XSS in Fusionpbx

CVE-2019-16975

In FusionPBX up to 4.5.7, the file app\contacts\contact_notes.php uses an unsanitized "id" variable coming from the URL, which is reflected in HTML, leading to XSS.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-10-23 · 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: 0.007 (50.1th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 50th percentile — 50.1% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

Fusionpbx

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

github.com/fusionpbx/fusionpbx/commit/80f2ce087ab1343f1ff3bf8a058eed9b5027eb8c (Patch)
resp3ctblog.wordpress.com/2019/10/19/fusionpbx-xss-8/ (Third Party Advisory)

Frequently asked questions

What is CVE-2019-16975?: CVE-2019-16975 is a medium-severity vulnerability in Fusionpbx, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2019-10-23.
How severe is CVE-2019-16975?: Medium severity. CVSS v3 base score is 6.1 out of 10.