---
id: CVE-2026-120987
title: >-
  Whale Browser before 5.39.412.57 allows an attacker to bypass the iframe
  sandbox in a dual-tab environment.
summary: >-
  Whale Browser before 5.39.412.57 allows an attacker to bypass the iframe
  sandbox in a dual-tab environment.
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N'
cvssSource: adp
cwe:
  - CWE-346
vendor: NAVER
product: NAVER Whale browser
affected:
  - whale_browser (all versions)
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-11-06T18:41:32.606750Z'
published: '2026-11-03'
updated: '2026-11-06'
sourceUpdated: '2026-11-06T18:41:55.449Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-120987'
references:
  - url: 'https://cve.naver.com/detail/cve-2026-120987.html'
tags:
  - cve.org
epss: 0.00145
epssPercentile: 0.03782
ingestedAt: '2026-11-05T19:30:42.925Z'
---

## Overview

Whale Browser before 5.39.412.57 allows an attacker to bypass the iframe sandbox in a dual-tab environment.

## Affected

- `whale_browser (all versions)`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.