CVE-2026-33140

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" />

Affected packages (1)

• PyPI/pyspectorfrom 0, < 0.1.7

CVSS scores

References (3)

• ADVISORYhttps://nvd.nist.gov/vuln/detail/CVE-2026-33140
• PATCHhttps://github.com/ParzivalHack/PySpector
• WEBhttps://github.com/ParzivalHack/PySpector/security/advisories/GHSA-2gmv-2r3v-jxj2