Stored XSS in Frappe 16.10.0 via Unsafe HTML Attribute Handling

Publication date: 2026-04-22

Last updated on: 2026-04-27

Assigner: Fluid Attacks

Description

An authenticated attacker can persist crafted values in multiple field types and trigger client-side script execution when another user opens the affected document in Desk. The vulnerable formatter implementations interpolate stored values into raw HTML attributes and element content without escaping This issue affects Frappe: 16.10.0.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-04-22

Last Modified

2026-04-27

Generated

2026-07-06

AI Q&A

2026-04-23

EPSS Evaluated

2026-07-05

NVD

CVE-2026-3837

Affected Vendors & Products

Vendor	Product	Version / Range
frappe	desk	16.10.0

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
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.

Attack-Flow Graph

Executive Summary

This vulnerability allows an authenticated attacker to store specially crafted values in multiple field types within the affected application. When another user opens the affected document in Desk, these stored values can trigger the execution of client-side scripts.

The root cause is that the vulnerable formatter implementations insert stored values directly into raw HTML attributes and element content without properly escaping them, leading to potential script execution.

Impact Analysis

This vulnerability can lead to client-side script execution when a user opens a document containing the crafted values. This could allow attackers to perform actions such as stealing user session data, executing malicious scripts in the context of the victim's browser, or manipulating the user interface.

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