Missing Authorization Flaw in BloodHound Allows Unauthorized Modifications
CVE-2026-59255

7.1HIGH

Key Information:

Vendor

Specterops

Status
Bloodhound
Vendor
CVE Published:
15 July 2026

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2026-59255?

BloodHound versions up to 9.4.0 contain a vulnerability within the custom-nodes API endpoints due to inadequate authorization checks. This flaw permits any authenticated user to manipulate the global graph schema. Exploitable by attackers holding valid session tokens, it enables the creation, modification, and deletion of custom node types. These unprotected operations expose the system to potential harm, affecting all users and tenants relying on this functionality.

Affected Version(s)

BloodHound 0 <= 9.4.0

BloodHound 8f790351349fd87bcb04377aba84cba6495825b3

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2026-59255 - Proof of Concept

References

https://github.com/SpecterOps/BloodHound/issues/2910
technical-descriptionexploit
https://github.com/SpecterOps/BloodHound/pull/2989
issue-tracking
https://github.com/SpecterOps/BloodHound/commit/8f7903513...
patch

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
High
Availability:
Low
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

George Chen
.