CVE-2026-41320: Frappe HR SQL Injection Vulnerability

CVE-2026-41320 Overview

CVE-2026-41320 is a SQL Injection vulnerability in Frappe HR, an open-source human resources management solution (HRMS). Prior to versions 15.54.0 and 14.38.1, a specially crafted request made to a certain endpoint could result in SQL injection, allowing an attacker to extract information they wouldn't otherwise be able to access.

Critical Impact

This SQL injection vulnerability allows authenticated attackers with low privileges to extract sensitive HR data including employee personal information, salary details, and other confidential organizational data from the database.

Affected Products

• Frappe HR versions prior to 15.54.0
• Frappe HR versions prior to 14.38.1
• Frappe HRMS open-source deployments running unpatched versions

Discovery Timeline

• 2026-04-21 - CVE-2026-41320 published to NVD
• 2026-04-22 - Last updated in NVD database

Technical Details for CVE-2026-41320

Vulnerability Analysis

This vulnerability is classified as CWE-89: SQL Injection, a critical web application security flaw where user-supplied input is improperly sanitized before being incorporated into SQL queries. In the context of Frappe HR, an attacker with valid credentials can craft malicious requests to a vulnerable endpoint, injecting SQL statements that bypass intended query logic.

The attack requires network access and low-level authentication, meaning an attacker needs valid user credentials to exploit this flaw. However, once authenticated, no additional user interaction is required. The vulnerability specifically impacts data confidentiality, enabling unauthorized extraction of sensitive human resources data without affecting data integrity or system availability.

Root Cause

The root cause of CVE-2026-41320 lies in insufficient input validation and sanitization within the Frappe HR application. A specific endpoint accepts user-controlled parameters that are directly concatenated or improperly parameterized into SQL queries. This allows attackers to manipulate the query structure by injecting malicious SQL syntax, breaking out of the intended query context and executing arbitrary database commands.

Attack Vector

The attack vector is network-based, requiring the attacker to send specially crafted HTTP requests to the vulnerable Frappe HR endpoint. The exploitation flow involves:

1. An authenticated user with low privileges identifies the vulnerable endpoint
2. The attacker crafts a malicious request containing SQL injection payloads
3. The unvalidated input is passed directly to the database query engine
4. The injected SQL statements execute, allowing data extraction through techniques such as UNION-based injection, error-based extraction, or blind SQL injection

The vulnerability manifests in the request handling logic where user input is incorporated into database queries without proper parameterization or escaping. See the GitHub Security Advisory for detailed technical information.

Detection Methods for CVE-2026-41320

Indicators of Compromise

• Unusual database query patterns containing SQL keywords like UNION, SELECT, OR 1=1, or comment sequences (--, /**/)
• Abnormal response times from the Frappe HR application indicating time-based blind SQL injection attempts
• Database error messages appearing in application logs or HTTP responses
• Unexpected data access patterns from low-privileged user accounts

Detection Strategies

• Deploy Web Application Firewall (WAF) rules to detect and block common SQL injection patterns in HTTP requests
• Enable comprehensive database query logging and monitor for anomalous query structures
• Implement application-layer monitoring to detect requests with SQL injection signatures targeting Frappe HR endpoints
• Review access logs for repeated requests to the same endpoint with varying parameter payloads

Monitoring Recommendations

• Configure alerts for database queries containing suspicious SQL syntax or unusual character sequences
• Monitor for authentication attempts followed by immediate data extraction patterns
• Track user account activity for unusual data access volumes or access to sensitive HR records
• Enable Frappe HR application logging at verbose levels to capture detailed request information

How to Mitigate CVE-2026-41320

Immediate Actions Required

• Upgrade Frappe HR to version 15.54.0 or later for v15.x deployments
• Upgrade Frappe HR to version 14.38.1 or later for v14.x deployments
• Review database access logs for evidence of exploitation attempts
• Conduct security audit of user accounts with database access permissions

Patch Information

Frappe has released security patches addressing this SQL injection vulnerability. Organizations running Frappe HR should upgrade to the following patched versions:

• Version 15.x: Upgrade to 15.54.0 or later
• Version 14.x: Upgrade to 14.38.1 or later

For detailed patch information and upgrade instructions, refer to the GitHub Security Advisory GHSA-745c-5q8r-vgj2.

Workarounds

• No official workarounds are available for this vulnerability - patching is required
• Implement network segmentation to restrict access to Frappe HR instances from untrusted networks
• Deploy Web Application Firewall (WAF) rules as a temporary protective measure while planning upgrade
• Restrict user account privileges to minimum required access levels

# Upgrade Frappe HR to patched version
bench update --apps hrms
bench --site your-site.local migrate
bench restart