CVE-2025-69234Network attack vector

Remote sandbox escape via improper sidebar checks

Published Dec 30, 2025 · Updated Dec 30, 2025

Sandbox escape in NAVER Whale Browser before 4.35.351.12 allows remote attackers to bypass iframe restrictions in the sidebar. The sidebar environment improperly enforces the standardized iframe sandbox security check, allowing framed content to escape its assigned restrictions. NAVER identifies only Windows as affected; the public advisory does not disclose the triggering input or the actions available after escape.

CVSS severity9.1
Critical
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Sandbox escape in NAVER Whale Browser before 4.35.351.12 allows remote attackers to bypass iframe restrictions in the sidebar. The sidebar environment improperly enforces the standardized iframe sandbox security check, allowing framed content to escape its assigned restrictions. NAVER identifies only Windows as affected; the public advisory does not disclose the triggering input or the actions available after escape.

The record

CVE
CVE-2025-69234
Published
Dec 30, 2025
Updated
Dec 30, 2025
Vendor
NAVER Corporation
Product
NAVER Whale Browser
Classifications
CWE-358, T1203
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Dec 30, 2025CVE publishedPublication date reported by the CVE source.
  2. Dec 30, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected versions are unavailable in this record. Check the vendor advisory for version and patch details.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

NAVER Corporation · NAVER Whale BrowserAffected versions are unavailable in this record.

Published CVSS scores

9.1CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A: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 exploitUnconfirmed

Weakness, pattern, technique

CWE-358Improperly Implemented Security Check for Standard
T1203Exploitation for Client Execution

Public exploit references

No public exploit references are available in this record.

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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