CVE-2026-59255

BloodHound Missing Authorization on Custom Node Management API

Published Jul 15, 2026 CVSS 4.0 · 7.1 High EPSS < 1% KEV · Not listed

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.

Analysis

Technical impact

BloodHound versions up to 9.4.0 contain a missing authorization check in the custom‑nodes API endpoints. Any user authenticated with a valid session token can use unprotected POST, PUT, and DELETE operations on these endpoints to create, update, or delete custom node types, thereby altering the global graph schema used by all users and tenants. This change can compromise the integrity of modeling data and the overall network representation.

Affected Systems

SpecterOps BloodHound, versions through 9.4.0. The vulnerability was fixed in commit 8f79035, which added authorization checks to the custom‑nodes API.

Risk and Exploitability

The CVSS score of 7.1 indicates a moderate to high risk, while the EPSS score of less than 1% suggests a low probability of exploitation at present. The vulnerability is not listed in CISA KEV. The likely attack vector requires a valid authenticated session token; attackers can exploit this vector by sending POST, PUT, or DELETE requests to the custom‑nodes endpoints, resulting in unauthorized changes to the global graph schema.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

SpecterOps

BloodHound

unaffected

Version	Status	Constraints
`0`	affected	≤ 9.4.0
`8f790351349fd87bcb04377aba84cba6495825b3`	unaffected	—

No data.

Vendor Product Versions

Specterops

Bloodhound

Version	Status	Scheme	Platform
`[0,9.4.0]`	affected	semver	—
`8f790351349fd87bcb04377aba84cba6495825b3`	unaffected	code_commit	—

Remediation

No solution or workaround provided in the CVE record.

OpenCVE Recommended Actions

Upgrade SpecterOps BloodHound to a version that includes commit 8f79035 (e.g., 9.4.1 or later).
If a patch upgrade is not immediately available, restrict access to the custom‑nodes API to privileged users only or disable it for non‑admin roles.
After remediation, review existing custom node types and remove any that were added by untrusted users to restore the original graph schema.

Generated by OpenCVE AI on July 31, 2026 at 03:15 UTC.

Tracking

Advisories

No advisories available

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact High

Vulnerable System Availability Impact Low

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact None

Integrity Impact High

Availability Impact Low

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.439% probability within 30 days)

Exploitation poc

Automatable no

Technical Impact partial

References

Link	Providers
https://github.com/SpecterOps/BloodHound/commit/8f790351349fd87bcb04377aba84cba6495825b3
https://github.com/SpecterOps/BloodHound/issues/2910
https://github.com/SpecterOps/BloodHound/pull/2989
https://www.vulncheck.com/advisories/bloodhound-missing-authorization-on-custom-node-management-api

History

Jul 28, 2026 2:30 AM First appearance in the feed. Affected versions updated. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Bloodhound Project Bloodhound Project bloodhound
CPEs		cpe:2.3:a:bloodhound_project:bloodhound::::::::
Vendors & Products		Bloodhound Project Bloodhound Project bloodhound

Jul 23, 2026 10:45 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Specterops Specterops bloodhound
Vendors & Products		Specterops Specterops bloodhound

Jul 15, 2026 7:30 PM Scoring metrics updated View changes

Type	Values Removed	Values Added
Metrics		ssvc `{'options': {'Automatable': 'no', 'Exploitation': 'poc', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Jul 15, 2026 5:30 PM Description updated. Title updated. Weaknesses updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
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.
Title		BloodHound Missing Authorization on Custom Node Management API
Weaknesses		CWE-862
References		https://github.com/SpecterOps/BloodHound/commit/8f790351349fd87bcb04377aba84cba6495825b3 https://github.com/SpecterOps/BloodHound/issues/2910 https://github.com/SpecterOps/BloodHound/pull/2989 https://www.vulncheck.com/advisories/bloodhound-missing-authorization-on-custom-node-management-api
Metrics		cvssV3_1 `{'score': 7.1, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:L'}` cvssV4_0 `{'score': 7.1, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:H/VA:L/SC:N/SI:N/SA:N'}`