Stored XSS via unencoded customer phone number
Published Dec 17, 2025 · Updated Dec 17, 2025
Stored XSS in Open Source Point of Sale 3.4.1 allows remote authenticated users to inject script through a customer phone number. The Create/Update Customers flow stores the phone_number value in the database and later renders it into HTML without sufficient sanitization or context-aware output encoding. Administrator access is required to submit the crafted save request, and the stored script executes in another user's browser when the customer record is viewed.
Summary
What happened
Stored XSS in Open Source Point of Sale 3.4.1 allows remote authenticated users to inject script through a customer phone number. The Create/Update Customers flow stores the phone_number value in the database and later renders it into HTML without sufficient sanitization or context-aware output encoding. Administrator access is required to submit the crafted save request, and the stored script executes in another user's browser when the customer record is viewed.
The record
- CVE
- CVE-2025-66923
- Published
- Dec 17, 2025
- Updated
- Dec 17, 2025
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-20, CWE-79, T1059.007
- Attack vector
- network
- Privileges
- admin
Timeline
How it unfolded
- Dec 17, 2025CVE publishedPublication date reported by the CVE source.
- Dec 17, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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What is affected?
Affected products and versions are unavailable in this record.
Published CVSS scores
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.
Weakness, pattern, technique
Public exploit references
- Customer phone_number stored XSS proof of conceptproof of concept · demonstrated
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Technologies
Your stack
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Your stack
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