CVE-2026-59255

Deferred Deferred - Pending Action

BloodHound Missing Authorization in Custom-Nodes API

Publication date: 2026-07-15

Last updated on: 2026-07-15

Assigner: VulnCheck

Description

BloodHound through 9.4.0, fixed in commit 8f79035, contains a missing authorization vulnerability in the custom-nodes API endpoints that allows any authenticated user to modify the global graph schema. Attackers with valid session tokens can create, update, or delete custom node types affecting all users and tenants by invoking unprotected POST, PUT, and DELETE operations on the custom-nodes endpoints.

CVSS Scores

EPSS Scores

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Meta Information

Published

2026-07-15

Last Modified

2026-07-15

Generated

2026-08-05

AI Q&A

2026-07-16

EPSS Evaluated

2026-08-03

NVD

CVE-2026-59255

EUVD

EUVD-2026-44754

Affected Vendors & Products

Vendor	Product	Version / Range
bloodhound	bloodhound	to 9.4.0 (inc)
specterops	bloodhound	to 9.4.0 (inc)

Helpful Resources

Exploitability

CWE

KEV

CWE ID	Description
CWE-862	The product does not perform an authorization check when an actor attempts to access a resource or perform an action.

Attack-Flow Graph

Executive Summary

CVE-2026-59255 is a missing authorization vulnerability in BloodHound versions up to 9.4.0. It allows any authenticated user with a valid session token to modify the global graph schema by performing unauthorized POST, PUT, and DELETE operations on custom-nodes API endpoints. This affects all users and tenants.

Detection Guidance

To detect this vulnerability, check BloodHound API logs for unauthorized POST, PUT, or DELETE requests to /api/v2/custom-nodes endpoints. Monitor for any modifications to custom node types by users without opengraph:Write permissions. Verify if read-only users can perform schema changes.

Impact Analysis

An attacker with low privileges could exploit this to create, update, or delete custom node types, disrupting the global graph schema. This may lead to data corruption, unauthorized access, or privilege escalation within the BloodHound instance.

Compliance Impact

This vulnerability could lead to unauthorized modifications of data structures, potentially violating integrity and access control requirements in GDPR and HIPAA. Unauthorized changes may compromise data accuracy and security, risking compliance violations.

Mitigation Strategies

Update BloodHound to the latest version with the fix (commit 8f79035 or later). Ensure all API endpoints enforce opengraph:Write permissions for write operations. Review user roles and revoke unnecessary permissions. Monitor for suspicious activity in custom node management.

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