CVE-2026-39380Public exploitNetwork attack vector

Cross-user script execution via unescaped stock location

Published Apr 7, 2026 · Updated Apr 7, 2026

Stored XSS in Open Source Point of Sale before 3.4.3 allows remote authenticated users to run JavaScript in another user's browser. The /config/saveLocations endpoint stores unescaped stock_location values, and app/Views/employees/form.php renders them without output encoding. A valid account can plant the payload, but execution requires another authenticated user to open the new-employee interface, enabling in-session actions, interface defacement, phishing, or credential capture.

CVSS severity5.4
Medium
EPSS probability0.16%
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 Open Source Point of Sale before 3.4.3 allows remote authenticated users to run JavaScript in another user's browser. The /config/saveLocations endpoint stores unescaped stock_location values, and app/Views/employees/form.php renders them without output encoding. A valid account can plant the payload, but execution requires another authenticated user to open the new-employee interface, enabling in-session actions, interface defacement, phishing, or credential capture.

The record

CVE
CVE-2026-39380
Published
Apr 7, 2026
Updated
Apr 7, 2026
Vendor
opensourcepos
Product
Open Source Point of Sale
Classifications
CWE-79, T1189
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 7, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 7, 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?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 3.4.3

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

opensourcepos · Open Source Point of Saleversion=< 3.4.3

Published CVSS scores

5.4GitHub, Inc.CVSS:3.1/AV:N/AC:L/PR:L/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.

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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
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

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

Public exploit references

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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