Cyber Resilience

CVE-2026-9963

HighUpdated

Published: 28 May 2026

Published
28 May 2026
Modified
17 June 2026
KEV Added
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Patch
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CVSS Score v3.1 7.5 CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
EPSS Score 0.0028 19.6th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-9963 is a high-severity Use of Uninitialized Variable (CWE-457) vulnerability in Google Chrome. Its CVSS base score is 7.5 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Drive-by Compromise (T1189); ranked at the 19.6th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

Uninitialized Use in iOS in Google Chrome on iOS prior to 148.0.7778.216 allowed a remote attacker who convinced a user to engage in specific UI gestures to execute arbitrary code inside a sandbox via a crafted HTML page. (Chromium security…

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severity: High)

CWE(s)
CWE-457

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1189 Drive-by Compromise Initial Access
Adversaries may gain access to a system through a user visiting a website over the normal course of browsing.
attack.mitre.org →
T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
T1204.001 Malicious Link Execution
An adversary may rely upon a user clicking a malicious link in order to gain execution.
attack.mitre.org →
Why these techniques?

Browser RCE via crafted HTML page with user interaction directly enables drive-by compromise and client-side exploitation techniques.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2026-9956Same product: Apple Iphone Os
CVE-2026-10896Same product: Apple Iphone Os
CVE-2026-7897Same product: Apple Iphone Os
CVE-2026-10951Same product: Apple Iphone Os
CVE-2026-10885Same product: Apple Iphone Os
CVE-2026-10952Same product: Apple Iphone Os
CVE-2026-9955Same product: Apple Iphone Os
CVE-2026-10958Same product: Apple Iphone Os
CVE-2026-9971Same product: Apple Iphone Os
CVE-2026-11165Same product: Apple Iphone Os

Affected Assets

google
chrome
≤ 148.0.7778.216

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References