CVE-2026-38444

MEDIUM 6.1

CVSS Score

6.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

Vendor	n/a
Product	n/a
Published	Aug 3, 2026
Last Updated	Aug 3, 2026

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Affected Versions

n/a / n/a

n/a

References

NVD ↗ CVE.org ↗ EPSS Data ↗

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