CVE-2026-38446 json
A stored cross-site scripting (XSS) vulnerability exists in osTicket 1.18.3 due to improper sanitization of the thread entry title field.
published 2026-08-03 3 mo ago modified 2026-08-31 2 mo ago also EUVD-2026-52403
- cvss
- 6.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.3%
- EPSS 0.3% chance of exploitation in 30 days, percentile 27%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- 3 mo ago
Exploit prediction
0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
| CNA | 3.1 | 6.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N |
Classification
- Weakness
-
- CWE-79 Improper Neutralization of Input During Web Page Generation
References
- github.com /osTicket/osTicket/commit/1e39bf1cf78fa298285f19b98f6a6dbb6808de19
- github.com /osTicket/osTicket/blob/v1.18.3/include/staff/templates/thread-entry.tmpl.php#L84
- github.com /osTicket/osTicket/blob/v1.18.3/include/staff/templates/thread-entries.tmpl.php
- github.com /osTicket/osTicket/blob/v1.18.3/include/staff/templates/reply-expand.tmpl.php
- github.com /fr3akhacks/cve-disclosures/blob/master/osTicket/CVE-2026-38446.md
Sources
- CVE List CVE-2026-38446
- NVD CVE-2026-38446
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