CVE-2026-38446: osTicket · Cross-site Scripting
Source CVE Database V5
Not known to be exploited · CVSS 6.1 Medium.
Data as of 26 Oct 2026, 14:05 UTC
- EPSS
- 0.3% chance of exploitation in 30 days – higher than 26% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:NExploitation evidence
Disclosed: evidence found.
CVE published 3 Aug 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
AI-suggested
Until an official fix is available, avoid opening or interacting with suspicious ticket replies or emails with unusual subject lines. Implementing additional output encoding or input sanitization on the thread entry title field may mitigate the risk. Monitor vendor channels for updates and apply patches once released.
Description
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.
References
- github.com/osTicket/osTicket/blob/v1.18.3/include/staff/templates/thread-entry.tmpl.php (opens in a new tab)
- github.com/osTicket/osTicket/blob/v1.18.3/include/staff/templates/thread-entries.tmpl.php (opens in a new tab)
- github.com/osTicket/osTicket/blob/v1.18.3/include/staff/templates/reply-expand.tmpl.php (opens in a new tab)
- github.com/fr3akhacks/cve-disclosures/blob/master/osTicket/CVE-2026-38446.md (opens in a new tab)
- github.com/osTicket/osTicket/commit/1e39bf1cf78fa298285f19b98f6a6dbb6808de19 (opens in a new tab)