Medium 6.1Published Aug 3, 2026

CVE-2026-38444osTicket v1.18.3 is vulnerable to Stored Cross-Site Scripting (XSS) via the email From-header display name.

Updated under an hour ago (2026-10-19 09:20 UTC)

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Exploited in the last 30 days

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: 6.1 MEDIUM (v3.1, CISA ADP)CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: mitre
NVD analysis: Deferred
Record last updated: Aug 3, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

No affected products are listed yet.

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.