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TI-2026-84160 Aliases CVE-2026-120987GHSA-w838-4h8q-4jvq

Iframe sandbox bypass in NAVER Whale browser

Priority LOW 38CWE-346Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Security bypass
Confidentiality · integrity · availability
None · High · None
Fix status
Fixed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-346.

Summary

NAVER Whale browser versions before 5.39.412.57 contain an origin validation error (CWE-346) that lets an attacker bypass the iframe sandbox in a dual-tab environment. A remote attacker with no privileges and no user interaction can exploit it to affect the integrity of data, with a CVSS 3.1 base score of 7.5.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

Description from the CNA

Whale Browser before 5.39.412.57 allows an attacker to bypass the iframe sandbox in a dual-tab environment.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00145 3rd percentileScored 2026-11-07
Fix Fixed NAVER Whale browser (NAVER): 5.39.412.57

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
NAVERNAVER Whale browser—5.39.412.57Patch availableCNA
  • NAVER Whale browser VendorNAVER Affected — Fixed in 5.39.412.57 Patch available CNA

CPE names Threatist (inferred) · 1

Inferred from how NVD named this product before; not given by a source.

CPEVersionsRoleVendor
cpe:2.3:a:navercorp:whale:*:*:*:*:*:*:*:*——Navercorp
  • cpe:2.3:a:navercorp:whale:*:*:*:*:*:*:*:* Versions — — ·Navercorp

Remediation

NAVER Whale browser should be updated to version 5.39.412.57 or later.

Written with Claude Haiku 5.5 from the sources below · 2026-11-06

  • Fix · CNA NAVER Whale browser (NAVER) Fixed in 5.39.412.57

Timeline

  1. 2026-11-03 Threatist record created from CVE-2026-120987
  2. 2026-11-03 Alias added: GHSA-w838-4h8q-4jvq
  3. 2026-11-06 CVSS score added · CISA ADP
  4. 2026-11-06 CISA SSVC decision points changed

References

Advisory 1

  • TI-2026-84161 billboard.js allows XSS via unsanitized series ids in legend templates CVSS 3.1MEDIUM 6.1
  • TI-2026-19139 Server-side request forgery in NAVER lucy-xss-filter CVSS 3.1MEDIUM 6.1
  • TI-2024-18782 Missing authorization in NAVER nGrinder CVSS 3.1MEDIUM 5.4
  • TI-2025-31281 Prototype pollution in NAVER billboard.js CVSS 3.1CRITICAL 9.8
  • TI-2024-18778 Deserialization of untrusted data in NAVER nGrinder CVSS 3.1CRITICAL 9.8
  • TI-2024-18777 Deserialization of untrusted data in NAVER nGrinder CVSS 3.1CRITICAL 9.8
See all 46 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences