Frappe ERPNext 16.16.0 email_id/mobile_no cross site scripting

CVSS Meta Temp Score
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Current Exploit Price (≈)
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CTI Interest Score
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3.5$0-$5k2.23-

Summaryinfo

A vulnerability described as problematic has been identified in Frappe ERPNext 16.16.0. The affected element is an unknown function. Such manipulation of the argument email_id/mobile_no leads to cross site scripting. This vulnerability is listed as CVE-2026-42840. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability was found in Frappe ERPNext 16.16.0. It has been rated as problematic. Affected by this issue is an unknown code block. The manipulation of the argument email_id/mobile_no with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. CVE summarizes:

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.

The weakness was presented by Oscar Naveda. The advisory is available at fluidattacks.com. This vulnerability is handled as CVE-2026-42840 since 04/30/2026. The exploitation is known to be easy. The attack may be launched remotely. Successful exploitation requires user interaction by the victim. Technical details are known, but there is no available exploit. This vulnerability is assigned to T1059.007 by the MITRE ATT&CK project.

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

Name

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔒
CNA CVSS-BT Score: 🔒
CNA Vector: 🔒

CVSSv3info

VulDB Meta Base Score: 3.5
VulDB Meta Temp Score: 3.5

VulDB Base Score: 3.5
VulDB Temp Score: 3.5
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cross site scripting
CWE: CWE-79 / CWE-94 / CWE-74
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: no mitigation known
Status: 🔍

0-Day Time: 🔒

Timelineinfo

04/30/2026 CVE reserved
06/03/2026 +34 days Advisory disclosed
06/03/2026 +0 days VulDB entry created
06/03/2026 +0 days VulDB entry last update

Sourcesinfo

Advisory: fluidattacks.com
Researcher: Oscar Naveda
Status: Not defined

CVE: CVE-2026-42840 (🔒)
GCVE (CVE): GCVE-0-2026-42840
GCVE (VulDB): GCVE-100-368198

Entryinfo

Created: 06/03/2026 21:44
Changes: 06/03/2026 21:44 (66)
Complete: 🔍
Cache ID: 216::103

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