CVE-2026-59255: BloodHound Missing Authorization on Custom Node Management API

Severity: high (CVSS 7.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.4% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-07-15 · updated 2026-10-24
Weakness: CWE-862

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.

Affected products

SpecterOps BloodHound: through 9.4.0

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

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