CVE-2026-120987EUVD-2026-115692GHSA-W838-4H8Q-4JVQVulnerabilityPublished
Whale Browser before 5.39.412.57 allows an attacker to bypass the iframe sandbox in a dual-tab environment.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
A 0-10 score for how bad the bug is in the worst case. It does not say how common the affected setup is.What do these mean? →—Not rated
- Exploited
- No known exploitation
- Fix
- No fix listed
- Who is exposed
- Not reported
5Pcve.now Index 5 of 100 · methodology v3 · provisional
- Exploitation?/40Exploitation: unknown (data gap). No CISA SSVC exploitation rating yet
- Exposure?/25Exposure: unknown (data gap). No advisory context yet
- Reach?/20Reach: unknown (data gap). No tracked technology or package matched
- Severity?/10Severity: unknown (data gap). No CVSS score or vendor rating
- No patch5/5No patch listed yet
What would change the score
- Would score about 60 if added to CISA KEV
- Would score about 55 if CISA's SSVC rates exploitation active
- Would score about 27 if advisories confirm default setups are exposed
CVE-2026-120987 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It affects NAVER Whale browser; no fixed version is listed yet.
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- Published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- FIRST's estimate of the chance attackers exploit it in the next 30 days, updated daily.What do these mean? →
- 0.11% · 1st percentile
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 5/100 · provisional
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
Whale Browser, a web browser from Naver, is affected by this vulnerability. An attacker could bypass the iframe sandbox protections when multiple tabs are open, potentially allowing malicious web content to escape its restrictions.
Read the original description
Whale Browser before 5.39.412.57 allows an attacker to bypass the iframe sandbox in a dual-tab environment.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- NAVER NAVER Whale browser
Version range not reported
Evidence 1
- Advisory
Corrections
None so far.
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