CVE-2026-120987
No CVSS score yet. EPSS 0.1% estimated probability of exploitation activity in the next 30 days.
Whale Browser before 5.39.412.57 allows an attacker to bypass the iframe sandbox in a dual-tab environment.
- EPSS
- 0.1% estimated probability of exploitation activity in the next 30 days; 1st percentile. Scored 2026-11-04. A forecast for this CVE across the internet, not for your own systems.
- CWE
- CWE-346 Origin Validation Error
- OWASP Top 10
- A07:2025 Authentication Failures
- Published
- Modified
- Record from
- the NVD, synced
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Explain CVE-2026-120987 for an engineer deciding whether to act. Use https://cve.bz/api/public/cves/CVE-2026-120987?via=ask-ai-copy and https://cve.bz/cve/CVE-2026-120987?via=ask-ai-copy as the source of truth: what is affected and which versions fix it, whether it is in CISA KEV, public exploits, and its EPSS (an internet-wide 30-day estimate of exploitation activity, not a forecast for my systems). If they give no fixed versions, use the CVE record https://cveawg.mitre.org/api/cve/CVE-2026-120987 or the vendor advisory, not third-party mirrors. Tell me how to check whether I am affected and how to verify a fix. Cite the sources and say where they are uncertain.Opens a third-party assistant; its answer is its own, not cve.bz's. The prompt holds only this CVE's id and public links.
Attack patterns (CAPEC)
The attack patterns MITRE's CAPEC relates to this record's weaknesses, as MITRE names them. Credits. More on the page of CWE-346 (16).