CVE-2026-39347: OrangeHRM Auth Bypass Vulnerability

CVE-2026-39347 Overview

OrangeHRM is a comprehensive human resource management (HRM) system used by organizations worldwide to manage employee data, performance reviews, and HR workflows. A vulnerability has been identified in OrangeHRM Open Source versions 5.0 through 5.8 that allows unauthorized modifications to self-appraisal submissions for administrator users after those submissions have been marked as completed. This authorization bypass breaks the integrity of finalized appraisal records and could lead to tampering with official HR documentation.

Critical Impact

Attackers with administrator access can modify completed self-appraisal submissions, compromising the integrity of finalized HR performance records and potentially affecting employee evaluations, compensation decisions, and compliance documentation.

Affected Products

• OrangeHRM Open Source versions 5.0 through 5.8
• OrangeHRM installations with self-appraisal functionality enabled
• Organizations using OrangeHRM for performance management workflows

Discovery Timeline

• 2026-04-07 - CVE CVE-2026-39347 published to NVD
• 2026-04-09 - Last updated in NVD database

Technical Details for CVE-2026-39347

Vulnerability Analysis

This vulnerability is classified under CWE-285 (Improper Authorization), indicating a flaw in the access control mechanisms that govern self-appraisal record modifications. The core issue lies in insufficient validation of the appraisal submission state when processing modification requests from administrator users.

When an employee completes their self-appraisal and submits it for review, the system should lock that submission to prevent any further changes. However, OrangeHRM fails to properly enforce this state restriction for users with administrator privileges. This means that even after a self-appraisal has been finalized and marked as complete, an administrator can still submit changes to those records through the application.

The vulnerability is exploitable over the network and requires high privileges (administrator access) but no user interaction to execute. The primary impact is to data integrity rather than confidentiality or availability, as attackers cannot use this vulnerability to access unauthorized data or disrupt system operations.

Root Cause

The root cause of this vulnerability is improper authorization validation in the self-appraisal modification workflow. The application fails to verify the completion status of appraisal records before accepting modification requests from administrator users. This represents a business logic flaw where the expected workflow state machine is not properly enforced for privileged accounts.

The authorization check likely only validates that the requesting user has administrator privileges without also verifying that the target appraisal record is in a modifiable state. This oversight allows administrators to bypass the intended workflow controls.

Attack Vector

The attack is executed over the network by an authenticated administrator user. The attacker would need valid administrator credentials to the OrangeHRM system. Once authenticated, they can target any completed self-appraisal submission and modify its contents through the standard application interface or API endpoints.

A malicious administrator could exploit this vulnerability to alter an employee's self-appraisal after it has been submitted and finalized. This could be used to manipulate performance records, sabotage an employee's standing within the organization, or create fraudulent documentation for compliance or legal purposes.

Detection Methods for CVE-2026-39347

Indicators of Compromise

• Audit logs showing modifications to self-appraisal records that were previously marked as completed
• Database records indicating appraisal content changes after the completion timestamp
• Administrator activity logs showing unusual patterns of appraisal record access or modification
• Discrepancies between employee-reported appraisal content and stored records

Detection Strategies

• Implement database triggers or application-level logging to track all modifications to appraisal records regardless of user privilege level
• Enable detailed audit logging for all HR-related data modifications in OrangeHRM
• Configure alerts for any write operations on records with a "completed" status flag
• Review administrator activity logs periodically for unusual patterns of appraisal access

Monitoring Recommendations

• Monitor OrangeHRM application logs for POST/PUT requests to appraisal endpoints targeting completed submissions
• Implement integrity monitoring for the appraisal database tables to detect unauthorized modifications
• Set up alerting for any appraisal modifications that occur after the designated submission deadline
• Consider implementing SentinelOne's Singularity Platform for endpoint detection and response to identify anomalous application behavior

How to Mitigate CVE-2026-39347

Immediate Actions Required

• Upgrade OrangeHRM Open Source to version 5.8.1 or later, which contains the fix for this vulnerability
• Review audit logs to identify any potentially unauthorized modifications to completed appraisals since deploying affected versions
• Implement additional access controls or workflow approvals for appraisal modifications as an interim measure
• Consider restricting administrator access to the minimum necessary personnel while awaiting patch deployment

Patch Information

OrangeHRM has released version 5.8.1 which addresses this authorization bypass vulnerability. Organizations running OrangeHRM Open Source versions 5.0 through 5.8 should upgrade immediately. For detailed patch information and upgrade instructions, refer to the OrangeHRM Security Advisory.

Workarounds

• Implement database-level constraints to prevent modifications to appraisal records once they are marked as completed
• Deploy a web application firewall (WAF) rule to intercept and block modification requests targeting finalized appraisal records
• Temporarily disable the self-appraisal feature if it is not immediately critical to operations until the patch can be applied
• Restrict administrator privileges to a minimal trusted group and enable detailed logging for all administrator actions

# Configuration example - Database constraint (MySQL)
# Add a trigger to prevent modifications to completed appraisals
# Note: This is a conceptual workaround - adapt to your specific schema
ALTER TABLE ohrm_self_appraisal 
ADD CONSTRAINT check_completion_status 
CHECK (status != 'completed' OR modified_date <= completion_date);