---
id: CVE-2026-33140
aliases:
  - GHSA-2gmv-2r3v-jxj2
  - PYSEC-2026-3029
title: >-
  Stored XSS in PySpector HTML Report Generation leads to Javascript Code
  Execution
summary: >-
  Stored XSS in PySpector HTML Report Generation leads to Javascript Code
  Execution
severity: medium
vendor: pyspector
product: pyspector
ecosystem: pip
affected:
  - pyspector < 0.1.7
patched:
  - pyspector 0.1.7
published: '2026-03-18'
updated: '2026-07-13'
source: OSV
sourceUrl: 'https://osv.dev/vulnerability/GHSA-2gmv-2r3v-jxj2'
references:
  - url: >-
      https://github.com/ParzivalHack/PySpector/security/advisories/GHSA-2gmv-2r3v-jxj2
  - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-33140'
  - url: 'https://github.com/ParzivalHack/PySpector'
tags:
  - osv
  - pip
epss: 0.00261
epssPercentile: 0.15899
ingestedAt: '2026-07-13T18:57:51.305Z'
---

## Overview

### Summary
PySpector versions `<= 0.1.6` are affected by a stored Cross-Site Scripting (XSS) vulnerability in the HTML report generator. When PySpector scans a Python file containing JavaScript payloads (i.e. inside a string passed to `eval()` ), the flagged code snippet is interpolated into the HTML report without sanitization. Opening the generated report in a browser causes the embedded JavaScript to execute in the browser's local file context.

### Impact
An attacker can craft a malicious Python file (for example, hosted in a public repository), designed to be scanned by PySpector. When a victim scans this file and opens the resulting HTML report, arbitrary JavaScript executes in their browser. While the `file://` context limits the attacker's ability to exfiltrate cookies or make credentialed requests, the following is still achievable:
- Arbitrary DOM manipulation
- Redirects to attacker-controlled pages
- Theft of locally accessible data via `fetch()` or `XMLHttpRequest` to `file://` paths (browser-dependent)

Any user of PySpector who scans untrusted code and generates HTML reports, is potentially affected.

### PoC

The following steps reproduce the vulnerability on PySpector `<= 0.1.6`:
1. Create a malicious Python file containing a JavaScript payload embedded in a string argument to `eval()`, and run PySpector against the file, generating an HTML report:
<img width="871" height="752" alt="image" src="https://github.com/user-attachments/assets/1b0a57f2-3632-4347-a9b7-6a94dc2e82b2" />
2. Open the generated HTML report in any browser:
<img width="1920" height="920" alt="image" src="https://github.com/user-attachments/assets/a4075c4a-6153-41b4-ad77-81d009d7a9f8" />

## Affected packages

- `pyspector < 0.1.7`

## Remediation

Upgrade to a patched release:

- `pyspector 0.1.7`