CVE-2026-33140Public exploitNetwork attack vector

JavaScript execution via unescaped report snippets

Published Mar 20, 2026 · Updated Mar 20, 2026

Stored XSS in ParzivalHack PySpector 0.1.6 and earlier allows remote attackers to execute JavaScript through a generated HTML report. The HTML report generator inserts flagged source snippets into report markup without escaping attacker-controlled script content. Exploitation requires a user to scan a crafted Python file and open its HTML report; the script runs in the browser's local-file context, enabling DOM changes, redirects, and browser-dependent reads of locally accessible data.

CVSS severity5.3
Medium
EPSS probability0.22%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Stored XSS in ParzivalHack PySpector 0.1.6 and earlier allows remote attackers to execute JavaScript through a generated HTML report. The HTML report generator inserts flagged source snippets into report markup without escaping attacker-controlled script content. Exploitation requires a user to scan a crafted Python file and open its HTML report; the script runs in the browser's local-file context, enabling DOM changes, redirects, and browser-dependent reads of locally accessible data.

The record

CVE
CVE-2026-33140
Published
Mar 20, 2026
Updated
Mar 20, 2026
Vendor
ParzivalHack
Product
PySpector
Classifications
CWE-79, T1204.002
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Mar 20, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 20, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=< 0.1.7

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

ParzivalHack · PySpectorversion=< 0.1.7

Published CVSS scores

6.1NIST NVDCVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
5.3GitHub, Inc.CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
T1204.002Malicious File

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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