---
id: "CVE-2026-111590"
kind: "vulnerability"
aliases: ["CVE-2026-111590"]
title: "Harbor: webhook targets can reach private and link-local addresses"
severity: "medium"
cvss: null
epss: null
exploited: false
status: "open"
category: "infrastructure"
products: []
ecosystems: []
tags: ["cloud", "harbor", "infrastructure", "kubernetes", "self-hosted"]
not_affected_if: ["auth-required", "default-config"]
published_at: "2026-10-26T14:16:28+00:00"
first_seen_at: "2026-10-26T14:30:36+00:00"
updated_at: "2026-10-26T14:32:54+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-111590", "first_seen_at": "2026-10-26T14:30:36+00:00"}]
---

# Harbor: webhook targets can reach private and link-local addresses

Harbor's webhook delivery does not block private and link-local IP targets, so a project admin can point a webhook at internal services. Error response bodies from those targets are written to the webhook execution log, which project members can read, potentially exposing cloud metadata.

_Summary, check and fix written by a model from the sources; labelled as such._

## How to check

- Check the Harbor version in use against the affected range listed in the NVD entry (unknown)
- Review whether webhook policies in projects point at private or link-local addresses such as `169.254.169.254`

## Timeline

- 2026-10-26T14:30:36+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-111590

## From the sources

A wide range of Harbor versions allow SSRF via its webhook delivery component which does not properly validate web hook target addresses, allowing usage of private and link-local IP ranges. An authenticated attacker with ProjectAdmin permissions can configure a webhook policy pointing to a private internal address. When a project event fires, Harbor jobservice makes unauthenticated outbound HTTP POST requests to the target. If the target answers with an error status, the response body is written to the webhook execution log, which project members can read, potentially exposing cloud metadata or other network-restricted resources.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_