CVE-2026-38444: n/a
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.
AI Analysis
Technical Summary
The vulnerability in osTicket v1.18.3 arises because the email From-header display name is extracted without proper sanitization in include/class.mailparse.php and stored raw in the poster field of the ost_thread_entry table. This allows an unauthenticated attacker to send a crafted reply email containing an XSS payload in the From display name to an existing ticket from an unregistered email address, resulting in stored cross-site scripting.
Potential Impact
Successful exploitation could allow an attacker to execute arbitrary JavaScript in the context of the affected osTicket application for users viewing the ticket thread entries. This could lead to session hijacking, defacement, or other client-side attacks. The vulnerability is exploitable by unauthenticated attackers via email, increasing the risk of exploitation.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, it is recommended to implement input sanitization or filtering on the email From-header display name before storage or rendering. Monitoring for suspicious email inputs and restricting ticket replies from unregistered addresses may reduce exposure.
CVE-2026-38444: n/a
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 v3.1
Score 6.1medium
Affected software
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in osTicket v1.18.3 arises because the email From-header display name is extracted without proper sanitization in include/class.mailparse.php and stored raw in the poster field of the ost_thread_entry table. This allows an unauthenticated attacker to send a crafted reply email containing an XSS payload in the From display name to an existing ticket from an unregistered email address, resulting in stored cross-site scripting.
Potential Impact
Successful exploitation could allow an attacker to execute arbitrary JavaScript in the context of the affected osTicket application for users viewing the ticket thread entries. This could lead to session hijacking, defacement, or other client-side attacks. The vulnerability is exploitable by unauthenticated attackers via email, increasing the risk of exploitation.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. Until a fix is available, it is recommended to implement input sanitization or filtering on the email From-header display name before storage or rendering. Monitoring for suspicious email inputs and restricting ticket replies from unregistered addresses may reduce exposure.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mitre
- Date Reserved
- 2026-04-06T00:00:00.000Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
Threat ID: 6a70defdbf32cb7a340162e8
Added to database: 08/03/2026, 18:33:33 UTC
Last enriched: 08/03/2026, 18:50:37 UTC
Last updated: 08/03/2026, 19:49:19 UTC
Views: 3
Community Reviews
0 reviewsCrowdsource mitigation strategies, share intel context, and vote on the most helpful responses. Sign in to add your voice and help keep defenders ahead.
Want to contribute mitigation steps or threat intel context? Sign in or create an account to join the community discussion.
Actions
Updates to AI analysis require Pro Console access. Upgrade inside Console → Billing.
Need more coverage?
Upgrade to Pro Console for AI refresh and higher limits.
For incident response and remediation, OffSeq services can help resolve threats faster.
Latest Threats
Check if your credentials are on the dark web
Instant breach scanning across billions of leaked records. Free tier available.