Is CVE-2026-78391 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-78391 being exploited in the wild.

How severe is CVE-2026-78391?

Informational severity, published 24 August 2026.

Is there a fix for CVE-2026-78391?

No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.

How is CVE-2026-78391 attacked?

It is attacked over the network, in a web application.

Am I affected by CVE-2026-78391?

Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-78391: RansomLook stored cross-site scripting in wallet detail view

CVE-2026-78391 · Severity: info · Published 2026-08-24

RansomLook is a web application that tracks ransomware-related cryptocurrency transactions. The application fails to properly validate cryptocurrency addresses imported from external sources before displaying them in the browser, allowing an attacker to inject malicious JavaScript code that executes when users interact with wallet export features, potentially exposing sensitive information or performing unauthorized actions.

Quick answers

Is CVE-2026-78391 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-78391 being exploited in the wild.
How severe is CVE-2026-78391?: Informational severity, published 24 August 2026.
Which products and versions are affected?: RansomLook.
Is there a fix for CVE-2026-78391?: No fixed version is recorded yet. Check the vendor's advisory in the references below. If you run it, Junglewise drafts a mitigation that fits your setup and applies it once you approve, with senior security engineers behind it.
How is CVE-2026-78391 attacked?: It is attacked over the network, in a web application.
Am I affected by CVE-2026-78391?: Check whether anything you run is named in the advisory. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

Technical details

This is a stored cross-site scripting (XSS) vulnerability in the cryptocurrency wallet detail view component. Cryptocurrency addresses and blockchain names sourced from external feeds (including the public crowd-sourced ransomwhe.re feed) are stored without sufficient validation and then embedded directly into inline JavaScript onclick handlers. Although Jinja HTML autoescaping is applied, it fails to protect against untrusted data inserted into JavaScript strings within HTML attributes because HTML entities are decoded before JavaScript interpretation. An attacker can craft a malicious cryptocurrency address containing quote characters and JavaScript syntax to escape the string literal and execute arbitrary code when a user clicks the wallet's CSV export button. Exploitation may not require authentication if the attacker can introduce a malicious wallet record into an upstream external data source. The patch validates cryptocurrency addresses and blockchain identifiers against a safe character set and replaces inline JavaScript handlers with data attributes and external event listeners.

Affected products

RansomLook

Timeline

2026-08-24: disclosed

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