CVE-2025-53599 Cross-site scripting in NAVER Whale browser

Critical 9.8 Published 4 Jul 2025 Updated 8 Jul 2025

An attacker can execute malicious scripts in the NAVER Whale browser for iOS via a crafted javascript scheme, potentially compromising user sessions or data.

Exploited in the wild: Not known
Login needed: Not needed
Attackable: Over the internet
Victim action needed: Not needed
Fix: None listed

What is CVE-2025-53599?

CVE-2025-53599 is a critical cross-site scripting vulnerability in NAVER Whale browser, published on 4 Jul 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.

Official description

Whale browser for iOS before 3.9.1.4206 allow an attacker to execute malicious scripts in the browser via a crafted javascript scheme.

Weakness: CWE-79

Which versions are affected by CVE-2025-53599?

It affects 1 product.

Products include Navercorp Whale.

How do I fix CVE-2025-53599?

No fix has been published for CVE-2025-53599 yet. Limit exposure of the affected software until one is available.

Escape output for the context it lands in and set a strict Content Security Policy. Upgrading the affected component is the real fix. More about Cross-site scripting.

Is CVE-2025-53599 being exploited?

There is no known exploitation of CVE-2025-53599 in the wild and no public exploit code.

Sources

Also known as GHSA-gq25-gcgv-4g86.