CVE-2026-78391
Received Received - Intake

Stored XSS in RansomLook Cryptocurrency Wallet Detail View

Publication date: 2026-08-24

Last updated on: 2026-08-24

Assigner: CIRCL

Description
RansomLook contains a stored cross-site scripting (XSS) vulnerability in the cryptocurrency wallet detail view. Cryptocurrency addresses and blockchain names originating from external sources, including the public crowd-sourced ransomwhe.re feed, were stored without sufficient validation and later embedded directly into an inline JavaScript onclick handler. Although Jinja HTML autoescaping was applied, it does not provide adequate protection when untrusted data is inserted into a JavaScript string inside an HTML attribute. HTML entities such as ' are decoded by the browser's HTML parser before the resulting attribute is interpreted as JavaScript. Consequently, a specially crafted cryptocurrency address containing quote characters and JavaScript syntax could escape the intended string literal and execute arbitrary JavaScript when a user clicked the affected wallet's CSV export button. Because cryptocurrency information imported from an untrusted upstream could reach the vulnerable rendering path, exploitation may not require an authenticated RansomLook account if an attacker can introduce a malicious wallet record into a consumed external data source. Successful exploitation could allow attacker-controlled JavaScript to execute in the security context of the RansomLook web application, potentially exposing information accessible to the victim or performing actions with the victim's privileges. The patch mitigates the issue by validating cryptocurrency addresses and blockchain identifiers before storage, restricting them to a safe character set, and replacing the inline JavaScript handler with data-* attributes and an external event listener so wallet values are treated strictly as data rather than executable JavaScript.

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Meta Information

Published
2026-08-24
Last Modified
2026-08-24
Generated
2026-08-24
AI Q&A
2026-08-24
EPSS Evaluated
N/A
NVD
CVE-2026-78391
EUVD
EUVD-2026-64891

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
ransomlook ransomlook *

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-79 The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.

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Executive Summary

RansomLook has a stored cross-site scripting (XSS) vulnerability where cryptocurrency addresses and blockchain names from external sources are stored without proper validation. These values are later embedded into a JavaScript onclick handler without adequate protection. A specially crafted address could escape the string literal and execute arbitrary JavaScript when a user interacts with the CSV export button.

Detection Guidance

To detect this vulnerability, inspect the RansomLook application for cryptocurrency wallet details that include malformed addresses or blockchain names. Check if addresses contain quote characters or JavaScript syntax. Review the CSV export functionality for inline JavaScript handlers in the wallet detail view. Use the validation functions in sharedutils.py to test if inputs are properly sanitized.

Impact Analysis

An attacker could inject malicious JavaScript that executes in the context of the RansomLook web application. This could expose sensitive information accessible to the victim or allow the attacker to perform actions with the victim's privileges. Exploitation may not require authentication if the attacker can introduce a malicious wallet record into an external data source.

Compliance Impact

This vulnerability could lead to unauthorized access to sensitive data, potentially violating GDPR (data protection) and HIPAA (health information privacy) by exposing user information or allowing unauthorized actions within the application.

Mitigation Strategies

Apply the patch from commit 7efb592 to validate cryptocurrency addresses and blockchain names before storage. Ensure only safe characters are allowed and replace inline JavaScript handlers with data-* attributes. Update the admin interface to reject invalid inputs and log warnings for skipped records.

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