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PYSEC-2026-3029

MediumCVSS 5.3 / 10
Published Jul 13, 2026·Last modified Jul 13, 2026
Affected Components(0)

No affected components available

Description

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" />
Risk Scores
Base Score
5.3

The vulnerability can be exploited over the network without needing physical access. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights.

Threat Intelligence
1.3

Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.

EPSS
N/A

Probability that this vulnerability will be exploited in the wild within the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

Related Vulnerabilities
  • CVE-2026-33140
    Alias
  • EUVD-2026-13776
    Alias

Browse More

Medium severity
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