Stored XSS via unencoded customer phone number
Published Feb 13, 2026 · Updated Feb 13, 2026
Stored XSS in OpenSourcePOS 3.4.1 allows remote authenticated users to run scripts in other users' browsers via a customer phone number. The Customers module stores the Phone Number value without adequate validation and later renders it without output encoding. Exploitation requires an authenticated account with customer-management permission and a victim who views the record, enabling actions in that victim's application session.
Summary
What happened
Stored XSS in OpenSourcePOS 3.4.1 allows remote authenticated users to run scripts in other users' browsers via a customer phone number. The Customers module stores the Phone Number value without adequate validation and later renders it without output encoding. Exploitation requires an authenticated account with customer-management permission and a victim who views the record, enabling actions in that victim's application session.
The record
- CVE
- CVE-2025-70091
- Published
- Feb 13, 2026
- Updated
- Feb 13, 2026
- Vendor
- Unknown vendor
- Product
- Unknown product
- Classifications
- CWE-79, T1059.007
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Feb 13, 2026CVE publishedPublication date reported by the CVE source.
- Feb 13, 2026Record 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
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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
- OpenSourcePOS 3.4.1 Customers 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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