CVE-2026-50026: Frappe Framework Auth Bypass Vulnerability

CVE-2026-50026 Overview

CVE-2026-50026 is a missing authorization vulnerability [CWE-862] affecting the Frappe full-stack web application framework. The flaw exists in framework endpoints that lacked permission checks, enabling unauthorized network-based access to protected resources. Frappe maintainers patched the issue in versions 15.107.0 and 16.17.0.

The vulnerability requires no authentication, no user interaction, and low attack complexity. Both confidentiality and integrity impacts are rated low, with no direct availability impact. Organizations running ERPNext or other Frappe-based deployments should treat this as a priority update.

Critical Impact
Unauthenticated network attackers can reach endpoints that should require permission checks, exposing limited resource data and allowing limited modification on unpatched Frappe instances prior to 15.107.0 and 16.17.0.

Affected Products

Frappe framework versions prior to 15.107.0
Frappe framework versions prior to 16.17.0
Downstream applications built on vulnerable Frappe releases, including ERPNext deployments

Discovery Timeline

2026-06-12 - CVE-2026-50026 published to NVD
2026-06-17 - Last updated in NVD database

Technical Details for CVE-2026-50026

Vulnerability Analysis

Frappe is a Python and JavaScript full-stack framework that powers ERPNext and many business applications. The framework exposes a large surface of server-side endpoints that handle document operations, reports, and administrative actions. Each endpoint is expected to enforce role and document-level permission checks before returning or modifying data.

In versions prior to 15.107.0 and 16.17.0, a subset of these endpoints did not invoke the required permission checks. An unauthenticated remote attacker reaching the application over the network can therefore call those endpoints directly and obtain or alter data that should be gated by authorization logic. The Frappe maintainers addressed the issue by adding the missing checks in the patched releases.

Root Cause

The root cause is a missing authorization check [CWE-862]. Affected endpoints proceeded to execute their handler logic without first calling Frappe's permission validation routines, such as document-level role checks. This skipped both authentication context evaluation and per-resource access controls.

Attack Vector

The attack vector is network-based and requires no privileges or user interaction. An attacker sends a crafted HTTP request to the vulnerable endpoint on an exposed Frappe site. Because permission checks are absent, the request is processed and returns data or performs the requested action. The Frappe security advisory (GHSA-q6m6-759h-46jp) is the authoritative reference for the specific endpoints involved.

No proof-of-concept exploit is publicly listed, and the EPSS probability stands at 0.26%. No code example is included here because no verified exploit sample is available.

Detection Methods for CVE-2026-50026

Indicators of Compromise

Unauthenticated HTTP requests to Frappe API endpoints, particularly under /api/method/ and /api/resource/, that return non-error responses without a session cookie or Authorization header.
Access log entries showing requests to internal framework methods from unexpected source IP ranges or automated user agents.
Document modifications or reads recorded in Frappe's activity logs without a corresponding authenticated user context.

Detection Strategies

Compare the running Frappe version against 15.107.0 and 16.17.0 across all sites and benches; flag any instance below these thresholds.
Inspect reverse-proxy and application logs for repeated calls to the same endpoint from a single source, which suggests enumeration of unauthenticated endpoints.
Correlate HTTP request logs with Frappe's Activity Log and Error Log doctypes to identify data access events that lack an associated user session.

Monitoring Recommendations

Enable verbose request logging at the web server tier and forward logs to a centralized analytics platform for retention and search.
Alert on 200-class responses to /api/method/ calls where no authentication header or session cookie is present.
Baseline normal API consumers and alert when new clients begin calling sensitive Frappe endpoints.

How to Mitigate CVE-2026-50026

Immediate Actions Required

Upgrade Frappe to version 15.107.0 or 16.17.0 or later on every site managed by your bench.
Audit recent access logs for unauthenticated calls to Frappe API endpoints since the affected versions were deployed.
Restrict network exposure of Frappe administrative endpoints to trusted networks or VPN clients until patching is complete.

Patch Information

Frappe addressed CVE-2026-50026 by adding the missing permission checks in versions 15.107.0 and 16.17.0. Refer to the Frappe GitHub Security Advisory GHSA-q6m6-759h-46jp for the official remediation details. Upgrade with bench update --patch after testing the target release in a staging environment.

Workarounds

Place Frappe behind a web application firewall and block direct access to /api/method/ calls that should never be invoked anonymously.
Enforce IP allow-listing on the reverse proxy for administrative and integration endpoints until the upgrade is applied.
Rotate API keys and review user role assignments after upgrading to confirm no unauthorized changes were made during the exposure window.

bash

# Upgrade Frappe via bench to a patched release
bench switch-to-branch version-15 frappe --upgrade
bench update --patch
bench --site all migrate