What is CVE-2019-10066?

CVE-2019-10066 is a medium-severity vulnerability in Otrs, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2019-05-22.

How severe is CVE-2019-10066?

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

XSS in Otrs

CVE-2019-10066

An issue was discovered in Open Ticket Request System (OTRS) 7.x through 7.0.6, Community Edition 6.0.x through 6.0.17, and OTRSAppointmentCalendar 5.0.x through 5.0.12. An attacker who is logged into OTRS as an agent with appropriate permissions may create a carefully crafted calendar appointment in order to cause execution of JavaScript in the context of OTRS.

Vulnerability class: XSS (Cross-Site Scripting)

Published 2019-05-22 · 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:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.008 (54.9th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 55th percentile — 54.9% 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

Otrs

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

community.otrs.com/security-advisory-2019-06-security-update-for-otrs-framework/ (Patch, Vendor Advisory)

Frequently asked questions

What is CVE-2019-10066?: CVE-2019-10066 is a medium-severity vulnerability in Otrs, classified under Cross-site Scripting. CVSS score: 5.4/10. Published 2019-05-22.
How severe is CVE-2019-10066?: Medium severity. CVSS v3 base score is 5.4 out of 10.