What is CVE-2025-49223?

CVE-2025-49223 is a critical-severity vulnerability in Naver Billboard.js, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 9.8/10. Published 2025-06-04.

How severe is CVE-2025-49223?

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

Is CVE-2025-49223 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Prototype Pollution in Naver Billboard.js

CVE-2025-49223

billboard.js before 3.15.1 was discovered to contain a prototype pollution via the function generate, which could allow attackers to execute arbitrary code or cause a Denial of Service (DoS) via injecting arbitrary properties.

Vulnerability class: Prototype Pollution

EPSS: 0.007 (50.4th percentile) — read the EPSS interpretation.

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.

Affected products

Naver Billboard.js — versions 3.15.1

Weakness classification (CWE)

CWE-1321 — Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution)

Public proof-of-concept exploits

References

cve@navercorp.com (vendor-advisory, Vendor Advisory)

Frequently asked questions

What is CVE-2025-49223?: CVE-2025-49223 is a critical-severity vulnerability in Naver Billboard.js, classified under Improperly Controlled Modification of Object Prototype Attributes (Prototype Pollution). CVSS score: 9.8/10. Published 2025-06-04.
How severe is CVE-2025-49223?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2025-49223 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.