Cyber Resilience

CVE-2026-9971

MediumUpdated

Published: 28 May 2026

Published
28 May 2026
Modified
17 June 2026
KEV Added
—
Patch
—
CVSS Score v3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
EPSS Score 0.0016 5.4th percentile
Risk Priority 35 floored blend · peak EPSS

Summary

CVE-2026-9971 is a medium-severity Cross-site Scripting (CWE-79) vulnerability in Google Chrome. Its CVSS base score is 5.4 (Medium).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploitation for Client Execution (T1203); ranked at the 5.4th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

OWASP Top 10 for Web (2025)

A05:2025 Injection

EU & UK References

Vulnerability details

Inappropriate implementation 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 inject arbitrary scripts or HTML (UXSS) via a crafted HTML page. (Chromium security…

more

severity: High)

CWE(s)
CWE-79

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1203 Exploitation for Client Execution Execution
Adversaries may exploit software vulnerabilities in client applications to execute code.
attack.mitre.org →
T1059.007 JavaScript Execution
Adversaries may abuse various implementations of JavaScript for execution.
attack.mitre.org →
Why these techniques?

UXSS enables client-side script injection via crafted page requiring user interaction, directly mapping to exploitation for client execution and JavaScript interpreter abuse.

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

CVEs Like This One

CVE-2020-16046Same product: Apple Iphone Os
CVE-2020-16030Same product: Google Chrome
CVE-2021-1879Same product: Apple Iphone Os
CVE-2020-36486Same product: Apple Iphone Os
CVE-2021-1826Same product: Apple Iphone Os
CVE-2021-30689Same product: Apple Iphone Os
CVE-2021-30744Same product: Apple Iphone Os
CVE-2021-1825Same product: Apple Iphone Os
CVE-2021-37999Same product: Google Chrome
CVE-2021-30890Same product: Apple Iphone Os

Affected Assets

google
chrome
≤ 148.0.7778.216

Mitigating Controls

Likely Mitigating Controls AI

Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.

CA-8 Penetration Testing
addresses: CWE-79

Penetration testing submits XSS payloads to web applications, detecting cross-site scripting flaws for subsequent remediation.

SI-10 Information Input Validation
addresses: CWE-79

Validates web inputs to reject script-related content that could produce XSS.

SI-15 Information Output Filtering
addresses: CWE-79

Output validation against expected content can reject or sanitize script content in generated web pages, reducing XSS exploitability.

References