---
id: "CVE-2025-52097"
kind: "vulnerability"
aliases: ["CVE-2025-52097"]
title: "InstantForum.NET: reflected XSS via unsanitized query string parameters"
severity: "unknown"
cvss: null
epss: null
exploited: false
status: "open"
category: "package"
products: []
ecosystems: []
tags: ["asp.net", "instantforum.net", "package", "self-hosted"]
not_affected_if: ["other-versions"]
published_at: "2026-10-16T15:16:50+00:00"
first_seen_at: "2026-10-23T21:57:13+00:00"
updated_at: "2026-10-25T05:27:44+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-52097", "first_seen_at": "2026-10-23T21:57:13+00:00"}]
---

# InstantForum.NET: reflected XSS via unsanitized query string parameters

InstantForum.NET 4.1.4 reflects query string parameters into HTML responses without output encoding. An attacker who gets a victim to open a crafted link can run script in the victim's browser session.

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

## How to check

- Check whether InstantForum.NET is deployed and confirm the version is `4.1.4`
- unknown

## Fix

- unknown

## Timeline

- 2026-10-23T21:57:13+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2025-52097

## From the sources

Cross Site Scripting vulnerability in InstantASP ltd, InstantForum.NET v.4.1.4 allows an attacker to execute arbitrary code via reflecting un-sanitized input from query string parameters directly into the HTML response without proper output encoding

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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_