Medium 5.1Published Jun 3, 2026

CVE-2026-42840ERPNext 16.16.0 - Stored XSS in POS customer section via unescaped template literals

Updated under an hour ago (Oct 26, 2026, 4:30 AM ET)

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It affects Frappe ERPNext. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

An authenticated user can persist arbitrary HTML/JavaScript in the email_id or mobile_no fields of a Customer record and trigger unescaped rendering in the Point of Sale (POS) interface for every operator who selects that customer. This issue affects ERPNext: 16.16.0.

CVSS: 5.1 MEDIUM (v4.0, CNA)CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N
Weakness (CWE): CWE-79
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Fluid Attacks
NVD analysis: Deferred
Record last updated: Jun 3, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Frappe ERPNext frappe:erpnext (from the name)	16.16.0	CNA record

References

https://fluidattacks.com/es/advisories/weekndthird-party-advisory
https://github.com/frappe/erpnextproduct

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.