---
id: "CVE-2026-55835"
kind: "vulnerability"
aliases: ["CVE-2026-55835"]
title: "Lookyloo: unauthenticated report endpoint can trigger MISP searches, risking denial of service"
severity: "medium"
cvss: 6.9
epss: 0.00315
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["lookyloo", "misp", "package", "self-hosted"]
not_affected_if: ["no-misp-configured", "version-1.39.4-or-later"]
published_at: "2026-10-23T05:17:15+00:00"
first_seen_at: "2026-10-23T21:57:32+00:00"
updated_at: "2026-10-25T03:38:37+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-55835", "first_seen_at": "2026-10-23T21:57:32+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-55835", "first_seen_at": "2026-10-24T07:15:51+00:00"}]
---

# Lookyloo: unauthenticated report endpoint can trigger MISP searches, risking denial of service

Lookyloo, a web tool that captures a website and maps the domains it calls, has a report API endpoint that mishandles its parameters. An unauthenticated user can force an admin-only search against a configured MISP instance, which can overload that MISP server.

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

## How to check

- Check the installed Lookyloo version; versions before `1.39.4` are affected.
- Check whether a MISP instance is configured in Lookyloo; the sources do not say how to confirm this beyond the configuration.

## Fix

- Upgrade Lookyloo to `1.39.4` or later.

## Timeline

- 2026-10-23T21:57:32+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-55835
- 2026-10-24T07:15:51+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-55835

## From the sources

Lookyloo is a web interface that allows users to capture a website page and then display a tree of domains that call each other. Prior to version 1.39.4, an unauthenticated user can trigger Lookyloo's "report a capture" email on demand (this is expected). The /json/<uuid>/report API endpoint (CaptureReport) is incorrectly passing the email and comment parameters, overwriting as_admin. When True, as_admin will trigger a search query on a MISP instance (if configured) and add a list of matching URLs in the email sent to the analyst (not the submitter, so there is no risk of leaking information) . It could potentially cause a DoS on the MISP instance. This issue has been patched in version 1.39.4.

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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_