CVE-2026-109626: Frappe ERPNext SQL Injection Vulnerability

CVE-2026-109626 Overview

CVE-2026-109626 is an SQL injection vulnerability in Frappe ERPNext versions before 16.34.2. The flaw stems from missing input validation across multiple application endpoints. Authenticated attackers holding low-privilege accounts can send crafted requests that inject SQL statements into backend queries. Successful exploitation allows extraction of sensitive data from the underlying database, including records the attacker is not authorized to view. The weakness is tracked under CWE-89 (Improper Neutralization of Special Elements used in an SQL Command).

Critical Impact
Authenticated low-privilege users can exfiltrate confidential business data from Frappe ERPNext databases through crafted requests to vulnerable endpoints.

Affected Products

Frappe ERPNext versions prior to 16.34.2
Deployments of ERPNext exposing authenticated endpoints to internal users
Self-hosted and cloud ERPNext instances running vulnerable releases

Discovery Timeline

2026-10-12 - CVE-2026-109626 published to NVD
2026-10-15 - Last updated in NVD database

Technical Details for CVE-2026-109626

Vulnerability Analysis

The vulnerability is a classic SQL injection flaw within Frappe ERPNext, an open-source enterprise resource planning platform. Multiple HTTP endpoints accept user-supplied parameters that flow into database queries without proper sanitization or parameterization. Because the affected endpoints require authentication, an attacker must first obtain valid credentials, including those of a low-privilege user account. Once authenticated, the attacker can manipulate request parameters to append or modify SQL clauses executed by the backend. This permits reading data from tables outside the attacker's authorization scope, such as financial records, customer information, or administrative configuration.

Root Cause

The root cause is missing input validation and improper query construction in multiple ERPNext endpoints. User input is concatenated into SQL statements rather than being passed through parameterized queries or an escaping layer. This design error allows attacker-controlled strings to alter the structure of the executed SQL, which is the defining pattern of CWE-89.

Attack Vector

The attack vector is network-based and requires authentication with low privileges. An attacker sends crafted HTTP requests to one of the vulnerable endpoints with payloads designed to break out of the intended query context. No user interaction is required, and the attack can be scripted against any reachable ERPNext instance. For technical specifics on the affected endpoints, see the Frappe GitHub Security Advisory GHSA-mp29-fjc5-h86p and the VulnCheck SQL Injection Advisory.

Detection Methods for CVE-2026-109626

Indicators of Compromise

HTTP requests to ERPNext endpoints containing SQL metacharacters such as single quotes, UNION SELECT, --, /*, or information_schema references in parameter values.
Unusual spikes in database query duration or error log entries referencing malformed SQL from the ERPNext application user.
Authenticated sessions from low-privilege accounts issuing high volumes of parameterized API calls across unrelated endpoints.

Detection Strategies

Enable verbose query logging on the ERPNext database and alert on syntactically unusual queries originating from the application service account.
Deploy a web application firewall rule set that inspects authenticated API traffic for SQL injection payloads, not only unauthenticated traffic.
Correlate application-layer audit logs with database query logs to identify low-privilege users accessing tables outside their business role.

Monitoring Recommendations

Monitor Frappe ERPNext access logs for repeated 500-series errors or query timeouts associated with a single authenticated session.
Track row-count anomalies on sensitive tables such as tabUser, tabCustomer, and financial doctypes.
Alert on any authenticated account that reads data volumes significantly beyond its historical baseline.

How to Mitigate CVE-2026-109626

Immediate Actions Required

Upgrade Frappe ERPNext to version 16.34.2 or later on all production and staging instances.
Audit existing user accounts and disable or rotate credentials for low-privilege accounts that are no longer required.
Review database and application logs covering the period before the upgrade for signs of exploitation.

Patch Information

The vendor fix is included in Frappe ERPNext release 16.34.2. Patch details and the list of affected endpoints are documented in the Frappe GitHub Security Advisory GHSA-mp29-fjc5-h86p. Administrators should apply the upgrade following standard Frappe bench update procedures and verify the resulting version with bench version.

Workarounds

Restrict network access to the ERPNext instance so only trusted users and networks can authenticate against the application.
Place a web application firewall in front of ERPNext with SQL injection signatures enabled for authenticated API routes.
Reduce the privilege level and role assignments for non-essential accounts to limit the blast radius of a compromised credential.

bash

# Configuration example: upgrade ERPNext to the patched release
cd /path/to/frappe-bench
bench get-app --branch version-16 erpnext
bench update --reset
bench --site all migrate
bench version | grep erpnext