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CVE-2025-69234VulnerabilityPublished Updated

CVE-2025-69234: NAVER Whale browser · Improperly Implemented Security Check for Standard

Affects NAVER Whale browserSource CVE Database V5

0

Not known to be exploited · CVSS 9.1 Critical : upgrade to 4.35.351.12 as a priority.

Data as of 26 Oct 2026, 08:30 UTC

CVSS 3.1 base score
9.1Critical
How severe the flaw is on the 0–10 CVSS scale.
EPSS
0.2% chance of exploitation in 30 days – higher than 21% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch
Available – fixed in 4.35.351.12
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 30 Dec 2025

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponised: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

What to do

Upgrade NAVER Whale browser to 4.35.351.12.

Affected software

ProductAffectedFixed in
NAVER NAVER Whale browserAffected
  • <4.35.351.12
Fixed in
  • 4.35.351.12

AI-suggested

Until patched, organizations should consider disabling or restricting the use of sidebar iframes within the Whale browser, especially in high-risk environments. Network-level controls such as web filtering can block access to untrusted or malicious websites that might attempt exploitation. Employing endpoint detection and response (EDR) solutions can help identify suspicious browser behaviors indicative of sandbox escapes. Security teams should audit browser usage across the organization to identify and limit Whale browser deployment where possible, substituting with more widely supported and regularly updated browsers. User awareness campaigns should inform employees about the risks of using outdated browsers and encourage prompt updates. Finally, implementing strict Content Security Policies (CSP) on internal web applications can reduce the risk of malicious iframe content.

Description

Whale browser before 4.35.351.12 allows an attacker to escape the iframe sandbox in a sidebar environment.

References

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