What is CVE-2020-16193?

CVE-2020-16193 is a medium-severity vulnerability in Enhancesoft Osticket, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2020-08-26.

How severe is CVE-2020-16193?

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

Is CVE-2020-16193 known to be exploited?

2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Enhancesoft Osticket

CVE-2020-16193

osTicket before 1.14.3 allows XSS because include/staff/banrule.inc.php has an unvalidated echo $info['notes'] call.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2020-08-26 · last modified 2026-07-10.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (45.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 46th percentile — 45.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

github.com/osTicket/osTicket/blob/develop/include/staff/banrule.inc.php (Patch, Third Party Advisory)
github.com/osTicket/osTicket/pull/5616/commits/fb570820ef1138776f929a179906e1d8… (Patch, Third Party Advisory)

Frequently asked questions

What is CVE-2020-16193?: CVE-2020-16193 is a medium-severity vulnerability in Enhancesoft Osticket, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2020-08-26.
How severe is CVE-2020-16193?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2020-16193 known to be exploited?: 2 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.