CVE-2026-38446Network attack vector

Stored XSS via unencoded thread entry titles

Published Aug 3, 2026 · Updated Aug 3, 2026

Stored XSS in the thread entry title field in osTicket 1.18.3 allows remote attackers to execute JavaScript in a ticket viewer's browser. The client and staff thread templates echo the stored $entry->title value without Format::htmlchars(), leaving attacker-controlled titles unencoded in HTML. An unauthenticated attacker can supply a malicious subject through inbound email, but a staff member or user must view the affected thread before the script can read ticket data or act with that viewer's permissions.

CVSS severity6.1
Medium
EPSS probability0.25%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in the thread entry title field in osTicket 1.18.3 allows remote attackers to execute JavaScript in a ticket viewer's browser. The client and staff thread templates echo the stored $entry->title value without Format::htmlchars(), leaving attacker-controlled titles unencoded in HTML. An unauthenticated attacker can supply a malicious subject through inbound email, but a staff member or user must view the affected thread before the script can read ticket data or act with that viewer's permissions.

The record

CVE
CVE-2026-38446
Published
Aug 3, 2026
Updated
Aug 3, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-79, T1189
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 3, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.6fr3akhacksCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:L/A:N
6.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1189Drive-by Compromise

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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