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CVE-2026-8945— Sandbox escape in Firefox and Firefox Focus for Android

Quick assessment

Affected
Mozilla Firefox
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Mozilla Firefox和Mozilla Firefox Focus for Android都是美国Mozilla基金会的产品。Mozilla Firefox是一款开源Web浏览器。Mozilla Firefox Focus for Android是一款专为Android设备设计的隐私浏览器。 Mozilla Firefox和Mozilla Firefox Focus for Android 151.0之前版本存在安全漏洞，该漏洞源于沙箱逃逸。

AI Predicted 9.8 Difficulty: Easy EPSS 0.40% · P32

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services

Affected Version Matrix 1

VendorProduct Version RangeStatus
Mozilla Firefox 151≤ * unaffected
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I. Basic Information for CVE-2026-8945

Vulnerability Information
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Vulnerability Title
Sandbox escape in Firefox and Firefox Focus for Android
Source: CVE Program / CVE List V5
Vulnerability Description
Sandbox escape in Firefox and Firefox Focus for Android. This vulnerability was fixed in Firefox 151.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Mozilla Firefox和Mozilla Firefox Focus for Android 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox和Mozilla Firefox Focus for Android都是美国Mozilla基金会的产品。Mozilla Firefox是一款开源Web浏览器。Mozilla Firefox Focus for Android是一款专为Android设备设计的隐私浏览器。 Mozilla Firefox和Mozilla Firefox Focus for Android 151.0之前版本存在安全漏洞，该漏洞源于沙箱逃逸。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Mozilla Firefox 151 ~ * -

II. Public POCs for CVE-2026-8945

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III. Intelligence Information for CVE-2026-8945

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Vendor Advisories for CVE-2026-8945 (1)

Same Patch Batch · Mozilla · 2026-05-19 · 32 CVEs total

CVE-2026-8961 Spoofing issue in the Form Autofill component
CVE-2026-8706 Sensitive user data could be leaked to other applications through Reader mode
CVE-2026-8975 Memory safety bugs fixed in Firefox ESR 115.36, Firefox ESR 140.11 and Firefox 151
CVE-2026-8974 Memory safety bugs fixed in Firefox ESR 140.11 and Firefox 151
CVE-2026-8973 Memory safety bugs fixed in Firefox 151
CVE-2026-8972 Privilege escalation in the WebRTC: Audio/Video component
CVE-2026-8971 Same-origin policy bypass in the Networking: JAR component
CVE-2026-8970 Privilege escalation in the Security component
CVE-2026-8969 Mitigation bypass in the DOM: Security component
CVE-2026-8968 Denial-of-service due to invalid pointer in the Audio/Video: Web Codecs component
CVE-2026-8967 Information disclosure in the Graphics: WebGPU component
CVE-2026-8966 Information disclosure in the IP Protection component
CVE-2026-8965 Information disclosure in the DOM: Security component
CVE-2026-8964 Spoofing issue in the Popup Blocker component
CVE-2026-8963 Spoofing issue in the Web Speech component
CVE-2026-8962 Mitigation bypass in the DOM: Security component
CVE-2026-8946 Incorrect boundary conditions in the Audio/Video: Web Codecs component
CVE-2026-8960 Spoofing issue in WebExtensions
CVE-2026-8959 Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component
CVE-2026-8958 Information disclosure, sandbox escape in the Security: Process Sandboxing component

Showing top 20 of 32 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2026-8945

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