What is CVE-2025-53599?

CVE-2025-53599 is a critical-severity vulnerability in Naver Whale Browser, classified under Cross-site Scripting. CVSS score: 9.8/10. Published 2025-07-04.

How severe is CVE-2025-53599?

Critical severity. CVSS v3 base score is 9.8 out of 10.

XSS in Naver Whale Browser

CVE-2025-53599

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

Vulnerability class: XSS (Cross-Site Scripting)

Published 2025-07-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.004 (32.8th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 33rd percentile — 32.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: +0.000

Affected products

Naver Whale Browser — versions 3.9.1.4206
Navercorp Whale

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

References

cve.naver.com/detail/cve-2025-53599.html (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2025-53599?: CVE-2025-53599 is a critical-severity vulnerability in Naver Whale Browser, classified under Cross-site Scripting. CVSS score: 9.8/10. Published 2025-07-04.
How severe is CVE-2025-53599?: Critical severity. CVSS v3 base score is 9.8 out of 10.