---
id: "CVE-2026-111720"
kind: "vulnerability"
aliases: ["CVE-2026-111720"]
title: "fish-island-backend: unauthenticated SSRF via /api/web/parse url parameter"
severity: "medium"
cvss: 6.9
epss: null
exploited: false
status: "open"
category: "other"
products: []
ecosystems: []
tags: ["fish-island-backend", "other", "self-hosted"]
not_affected_if: ["no-outbound-egress", "unreachable-from-internet"]
published_at: "2026-10-16T18:17:56+00:00"
first_seen_at: "2026-10-23T21:57:14+00:00"
updated_at: "2026-10-25T03:42:17+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-111720", "first_seen_at": "2026-10-23T21:57:14+00:00"}]
---

# fish-island-backend: unauthenticated SSRF via /api/web/parse url parameter

fish-island-backend through commit 7c61b78 has an unauthenticated server-side request forgery in GET /api/web/parse, where the url parameter makes the server fetch attacker-chosen URLs. An attacker can reach internal hosts, loopback services and cloud metadata endpoints and read back page titles, meta descriptions and favicons.

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

## How to check

- Check whether the deployed fish-island-backend build includes commit `7c61b78` or earlier.
- Look for the `/api/web/parse` route in the running service and whether it is reachable from outside the network.

## Timeline

- 2026-10-23T21:57:14+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-111720

## From the sources

fish-island-backend through commit 7c61b78 contains an unauthenticated server-side request forgery vulnerability that allows remote attackers to make the server fetch attacker-supplied URLs via the url parameter of GET /api/web/parse. Attackers can target internal hosts, loopback services or cloud metadata endpoints through redirect-following OkHttp requests and read back page titles, meta descriptions and favicons.

---

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