CVE-2026-30244: Plane Information Disclosure Vulnerability

CVE-2026-30244 Overview

CVE-2026-30244 is an Information Exposure vulnerability affecting Plane, an open-source project management tool. Prior to version 1.2.2, unauthenticated attackers can enumerate workspace members and extract sensitive information including email addresses, user roles, and internal identifiers. The vulnerability stems from Django REST Framework permission classes being incorrectly configured to allow anonymous access to protected endpoints.

Critical Impact

Unauthenticated attackers can extract sensitive user information including email addresses, roles, and internal identifiers from Plane workspaces without authentication, enabling reconnaissance for targeted attacks.

Affected Products

• Plane versions prior to 1.2.2

Discovery Timeline

• 2026-03-06 - CVE CVE-2026-30244 published to NVD
• 2026-03-10 - Last updated in NVD database

Technical Details for CVE-2026-30244

Vulnerability Analysis

This vulnerability represents an Information Exposure flaw (CWE-200) in the Plane project management application. The core issue lies in improperly configured Django REST Framework (DRF) permission classes that fail to enforce authentication requirements on sensitive API endpoints. When permission classes are misconfigured to allow AllowAny access or lack proper authentication guards, protected endpoints become accessible to anonymous users.

The vulnerability enables unauthenticated attackers to query workspace member endpoints and retrieve detailed user information that should require authenticated access. This exposed data includes user email addresses, assigned roles within workspaces, and internal system identifiers that could be leveraged for further attacks.

Root Cause

The root cause is a misconfiguration in Django REST Framework permission classes. In DRF, API views require explicit permission class declarations to enforce access control. When these permission classes are either omitted or incorrectly set to permissive values like AllowAny, the framework allows anonymous requests to reach endpoints that handle sensitive data. In Plane's case, workspace member listing endpoints lacked the proper IsAuthenticated permission class requirement, allowing any unauthenticated HTTP request to retrieve protected user information.

Attack Vector

This vulnerability is exploitable over the network without requiring any authentication or user interaction. An attacker can craft HTTP requests directly to the vulnerable API endpoints to enumerate workspace members. The attack flow involves:

1. Identifying accessible Plane instances exposed to the network
2. Sending unauthenticated requests to workspace member API endpoints
3. Parsing the JSON responses to extract email addresses, user roles, and internal identifiers
4. Using harvested information for targeted phishing campaigns, credential stuffing, or social engineering attacks

The vulnerability is particularly concerning for organizations using Plane for project management, as the exposed data can reveal organizational structure, key personnel, and internal project assignments.

Detection Methods for CVE-2026-30244

Indicators of Compromise

• Unusual volume of unauthenticated API requests to workspace member endpoints
• HTTP requests to /api/v1/workspaces/*/members/ endpoints lacking authentication headers
• Log entries showing successful responses to anonymous requests for user enumeration endpoints
• Spike in API traffic from unknown IP addresses targeting user-related endpoints

Detection Strategies

• Monitor web server access logs for unauthenticated requests to sensitive API endpoints
• Implement Web Application Firewall (WAF) rules to detect enumeration patterns against user listing endpoints
• Review application logs for successful API responses that return user data without authentication tokens
• Deploy API gateway monitoring to track anomalous access patterns to protected resources

Monitoring Recommendations

• Configure alerting for high-frequency requests to user enumeration endpoints from single IP addresses
• Implement rate limiting on API endpoints that expose user information
• Enable verbose logging for authentication failures and anonymous access attempts
• Regularly audit Django REST Framework permission class configurations across all API views

How to Mitigate CVE-2026-30244

Immediate Actions Required

• Upgrade Plane to version 1.2.2 or later immediately
• Review server access logs for evidence of prior exploitation attempts
• Audit all DRF API views to ensure proper permission classes are configured
• Implement network-level access controls to restrict exposure of Plane instances

Patch Information

The vulnerability has been patched in Plane version 1.2.2. Organizations should upgrade to this version or later to remediate the vulnerability. The fix properly configures Django REST Framework permission classes to require authentication for workspace member endpoints.

For detailed patch information, refer to the GitHub Release v1.2.2 and the GitHub Security Advisory GHSA-87x4-j8vh-p5qf.

Workarounds

• Restrict network access to Plane instances using firewall rules or VPN requirements
• Implement a reverse proxy with authentication requirements for all API endpoints
• Deploy a Web Application Firewall to block unauthenticated requests to sensitive endpoints
• Temporarily disable public access to Plane instances until patching is complete

# Example: Restrict access to Plane instance using nginx
# Add authentication requirement for API endpoints
location /api/ {
    auth_request /auth;
    proxy_pass http://plane_backend;
}

# Example: UFW firewall rule to restrict access
ufw allow from 10.0.0.0/8 to any port 3000
ufw deny 3000