CVE-2026-51896: infiniflow ragflow Privilege Escalation

CVE-2026-51896 Overview

CVE-2026-51896 is an improper access control vulnerability in Infiniflow RAGFlow version 0.25.3. The flaw resides in the resume function located in api/apps/connector_app.py. Depending on the exposed entry point, an authenticated attacker can perform unauthorized cross-session or privilege-crossing operations against other users or tenants.

The weakness is categorized under [CWE-284: Improper Access Control]. Exploitation requires network access and low privileges but no user interaction, allowing attackers to tamper with resources that belong to other sessions within the retrieval-augmented generation (RAG) platform.

Critical Impact
Authenticated attackers can perform cross-session or privilege-crossing write operations against RAGFlow connector resources, compromising data integrity across tenants.

Affected Products

Infiniflow RAGFlow 0.25.3
Deployments exposing the api/apps/connector_app.pyresume endpoint
RAG pipelines relying on the vulnerable connector module

Discovery Timeline

2026-10-01 - CVE-2026-51896 published to the National Vulnerability Database (NVD)
2026-10-05 - Last updated in NVD database

Technical Details for CVE-2026-51896

Vulnerability Analysis

RAGFlow is an open-source retrieval-augmented generation engine that provides connectors to external data sources. The connector_app.py module exposes HTTP endpoints that manage connector lifecycle operations, including pausing and resuming data ingestion jobs.

The resume handler fails to validate that the caller owns the target connector or has sufficient privileges to act on it. The endpoint accepts an identifier supplied by the client and operates on the referenced record without enforcing a tenant or session boundary check. This logic gap allows a low-privileged account to resume connectors that belong to other users, modifying the state of resources outside their authorization scope.

Root Cause

The root cause is missing authorization enforcement in the resume route of api/apps/connector_app.py. The handler authenticates the request but does not verify object-level ownership before executing the state change. This is a classic broken object-level authorization pattern tracked under [CWE-284].

Attack Vector

An attacker authenticates to the RAGFlow instance with any valid low-privilege account. The attacker then issues a crafted request to the resume endpoint referencing a connector identifier owned by another tenant or session. The server executes the operation without verifying ownership, producing an integrity impact on the targeted resource. Public proof-of-concept details are available in the Gist PoC Code and GitHub Issue Discussion.

Detection Methods for CVE-2026-51896

Indicators of Compromise

Requests to the resume endpoint in connector_app.py referencing connector IDs that do not belong to the authenticated session
Unexpected state transitions of paused connectors without corresponding owner activity
Access patterns where a single low-privilege account interacts with connector IDs across multiple tenants

Detection Strategies

Enable application-layer audit logging that records the authenticated principal, target object ID, and owning tenant for every connector action
Correlate the acting user ID with the owner ID of the targeted connector and alert when they diverge
Review web server access logs for sequential enumeration of connector identifiers against the resume route

Monitoring Recommendations

Forward RAGFlow application logs to a centralized analytics platform for cross-tenant anomaly detection
Baseline normal connector resume frequency per user and alert on statistical deviations
Monitor administrative actions on connectors outside business hours or from unusual source IPs

How to Mitigate CVE-2026-51896

Immediate Actions Required

Restrict network access to the RAGFlow management API to trusted administrators and internal networks
Audit existing user accounts and remove or downgrade accounts that do not require connector management permissions
Review historical logs for prior exploitation of the resume endpoint against connectors owned by other users

Patch Information

At the time of publication, no fixed version is listed in the NVD entry for CVE-2026-51896. Monitor the GitHub Issue Discussion for upstream remediation status and upgrade to a patched RAGFlow release when it becomes available.

Workarounds

Place the RAGFlow API behind a reverse proxy that enforces per-user authorization on connector endpoints
Apply a local patch to api/apps/connector_app.py that verifies the authenticated user owns the connector before executing resume
Segment multi-tenant deployments so each tenant runs an isolated RAGFlow instance until an official fix is released

bash

# Example reverse-proxy restriction for connector management routes
location ~ ^/v1/connector/(resume|pause) {
    allow 10.0.0.0/8;
    deny all;
    proxy_pass http://ragflow_upstream;
}