CVE-2026-38444

Description

osTicket v1.18.3 is vulnerable to Stored Cross-Site Scripting (XSS) via the email From-header display name. The value is extracted without sanitization in include/class.mailparse.php and stored raw in the poster field of ost_thread_entry. When an unauthenticated attacker sends a reply email to an existing ticket from an unregistered address with an XSS payload in the From display name.

CVSS Vector

References

• https://github.com/fr3akhacks/cve-disclosures/blob/master/osTicket/CVE-2026-38444.md
• https://github.com/osTicket/osTicket/blob/develop/include/class.mailparse.php
• https://github.com/osTicket/osTicket/commit/c54a6ac79de42cff35b453882d1d94cd38adb17f