XSS in N/a
CVE-2026-38446
A stored cross-site scripting (XSS) vulnerability exists in osTicket 1.18.3 due to improper sanitization of the thread entry title field. User-controlled input in the title is stored without adequate HTML escaping and later rendered in multiple staff-facing templates without proper output encoding. An attacker can inject arbitrary JavaScript by submitting a crafted ticket reply or email with a malicious subject line.
Vulnerability class: XSS (Cross-Site Scripting)
Published · last modified .
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: 0.003 (27.2th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 27.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000
Weakness classification (CWE)
References
- github.com/osTicket/osTicket/blob/v1.18.3/include/staff/templates/thread-entry…
- github.com/osTicket/osTicket/blob/v1.18.3/include/staff/templates/thread-entrie…
- github.com/osTicket/osTicket/blob/v1.18.3/include/staff/templates/reply-expand…
- github.com/fr3akhacks/cve-disclosures/blob/master/osTicket/CVE-2026-38446.md
- github.com/osTicket/osTicket/commit/1e39bf1cf78fa298285f19b98f6a6dbb6808de19
Frequently asked questions
- What is CVE-2026-38446?
- CVE-2026-38446 is a medium-severity vulnerability in N/a, classified under Cross-site Scripting. CVSS score: 6.1/10. Published 2026-08-03.
- How severe is CVE-2026-38446?
- Medium severity. CVSS v3 base score is 6.1 out of 10.