CVE-2026-2819: Dromara RuoYi-Vue-Plus Auth Bypass Flaw

CVE-2026-2819 Overview

A missing authorization vulnerability has been identified in Dromara RuoYi-Vue-Plus versions up to 5.5.3. This security flaw affects the SaServletFilter function within the /workflow/instance/deleteByInstanceIds endpoint of the Workflow Module. The vulnerability allows remote attackers to bypass authorization controls, potentially enabling unauthorized deletion of workflow instances without proper access validation.

Critical Impact

Remote attackers can exploit this missing authorization vulnerability to delete workflow instances without proper authentication, potentially disrupting business processes and causing data loss.

Affected Products

• Dromara RuoYi-Vue-Plus up to version 5.5.3
• Workflow Module component
• Applications using the affected SaServletFilter function

Discovery Timeline

• 2026-02-20 - CVE-2026-2819 published to NVD
• 2026-02-20 - Last updated in NVD database

Technical Details for CVE-2026-2819

Vulnerability Analysis

This vulnerability is classified as CWE-862 (Missing Authorization), a broken access control flaw where the application fails to perform adequate authorization checks before allowing access to protected resources. In the context of RuoYi-Vue-Plus, the SaServletFilter function does not properly validate user permissions when processing requests to the /workflow/instance/deleteByInstanceIds endpoint.

The vulnerability is accessible remotely over the network, requiring low-privileged access to exploit. An attacker can manipulate requests to bypass authorization controls, potentially resulting in unauthorized modification or deletion of workflow instance data. The vendor was contacted during responsible disclosure but did not respond, leaving users without an official patch at the time of publication.

Root Cause

The root cause of this vulnerability lies in the inadequate implementation of authorization controls within the SaServletFilter function. The filter fails to verify whether the requesting user has appropriate permissions to execute deletion operations on workflow instances. This missing authorization check allows authenticated users with minimal privileges to perform administrative actions they should not have access to.

Attack Vector

The attack vector is network-based, allowing remote exploitation. An attacker with low-level authentication can send crafted HTTP requests to the /workflow/instance/deleteByInstanceIds endpoint. Due to the missing authorization validation in the SaServletFilter, these requests are processed without verifying the user's permission level.

The exploitation flow involves:

1. Authenticating to the RuoYi-Vue-Plus application with any valid low-privileged account
2. Sending a DELETE or POST request to the vulnerable workflow endpoint
3. Bypassing authorization checks due to the missing validation in SaServletFilter
4. Successfully deleting workflow instances that should be protected by access controls

The exploit has been publicly disclosed and documented in vulnerability databases. For technical details and proof-of-concept information, refer to the VulDB entry #346944.

Detection Methods for CVE-2026-2819

Indicators of Compromise

• Unusual DELETE or POST requests to /workflow/instance/deleteByInstanceIds from low-privileged user accounts
• Unexpected workflow instance deletions in application logs without corresponding administrative actions
• Access logs showing repeated requests to workflow management endpoints from unauthorized user sessions
• Audit trail gaps where workflow instances were removed without proper authorization records

Detection Strategies

• Implement web application firewall (WAF) rules to monitor and alert on suspicious requests to /workflow/instance/deleteByInstanceIds
• Configure application-level logging to capture all requests to workflow management endpoints with user context
• Deploy SentinelOne Singularity Platform to detect anomalous API access patterns indicative of authorization bypass attempts
• Review application access logs for requests to workflow endpoints from users without administrative privileges

Monitoring Recommendations

• Enable detailed audit logging for all workflow module operations including deletions
• Set up alerts for bulk deletion requests or high-frequency access to workflow management endpoints
• Monitor user session activity for privilege escalation attempts or access to administrative functions
• Implement real-time monitoring of the SaServletFilter processing to detect authorization bypass patterns

How to Mitigate CVE-2026-2819

Immediate Actions Required

• Restrict network access to the /workflow/instance/deleteByInstanceIds endpoint using firewall rules or reverse proxy configurations
• Implement additional authorization middleware to validate user permissions before processing workflow deletion requests
• Review and audit existing workflow instances for any unauthorized modifications or deletions
• Consider temporarily disabling the affected workflow deletion functionality until a patch is available

Patch Information

No official patch has been released by the vendor at the time of publication. The vendor was contacted during responsible disclosure but did not respond. Users should monitor the official Dromara RuoYi-Vue-Plus repository for security updates. For additional vulnerability intelligence, refer to the VulDB CTI entry and VulDB submission #753321.

Workarounds

• Implement custom authorization middleware that explicitly validates user roles and permissions before allowing access to workflow deletion endpoints
• Use network segmentation to isolate the workflow module from untrusted network segments
• Deploy application-level access control lists (ACLs) to restrict workflow management functions to authorized administrators only
• Consider using a web application firewall to block or challenge requests to the vulnerable endpoint based on user context

Organizations running RuoYi-Vue-Plus should implement a custom authorization filter as an interim measure. This filter should intercept requests to /workflow/instance/deleteByInstanceIds and validate that the requesting user has explicit administrative permissions before allowing the request to proceed to the SaServletFilter. Additionally, enabling comprehensive audit logging will help detect any exploitation attempts while waiting for an official vendor patch.