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CVE-2026-8971— Same-origin policy bypass in the Networking: JAR component

AI Predicted 6.5 Difficulty: Moderate EPSS 0.01% · P3

Possible ATT&CK Techniques 1AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 2

VendorProductVersion RangeStatus
MozillaFirefox151≤ *unaffected
MozillaThunderbird151≤ *unaffected
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I. Basic Information for CVE-2026-8971

Vulnerability Information
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Vulnerability Title
Same-origin policy bypass in the Networking: JAR component
Source: NVD (National Vulnerability Database)
Vulnerability Description
Same-origin policy bypass in the Networking: JAR component. This vulnerability was fixed in Firefox 151 and Thunderbird 151.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Mozilla Firefox和Mozilla Thunderbird 访问控制错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox和Mozilla Thunderbird都是美国Mozilla基金会的产品。Mozilla Firefox是一款开源Web浏览器。Mozilla Thunderbird是一套从Mozilla Application Suite独立出来的电子邮件客户端软件。该软件支持IMAP、POP邮件协议以及HTML邮件格式。 Mozilla Firefox 151之前版本和Mozilla Thunderbird 151之前版本存在访问控制错误漏洞，该漏洞源于Networking: JAR组
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

VendorProductAffected VersionsCPESubscribe
MozillaFirefox 151 ~ * -
MozillaThunderbird 151 ~ * -

II. Public POCs for CVE-2026-8971

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III. Intelligence Information for CVE-2026-8971

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

CVE-2026-8960Spoofing issue in WebExtensions
CVE-2026-8945Sandbox escape in Firefox and Firefox Focus for Android
CVE-2026-8946Incorrect boundary conditions in the Audio/Video: Web Codecs component
CVE-2026-8947Use-after-free in the DOM: Bindings (WebIDL) component
CVE-2026-8948Same-origin policy bypass in the DOM: Networking component
CVE-2026-8949Integer overflow in the Widget: Win32 component
CVE-2026-8950Same-origin policy bypass in the Networking: HTTP component
CVE-2026-8951Spoofing issue in the Toolbar component in Firefox for Android
CVE-2026-8952Privilege escalation in the Application Update component
CVE-2026-8953Sandbox escape due to use-after-free in the Disability Access APIs component
CVE-2026-8954Incorrect boundary conditions, integer overflow in the Audio/Video component
CVE-2026-8955Privilege escalation in the DOM: Workers component
CVE-2026-8956Integer overflow in the Networking: JAR component
CVE-2026-8957Privilege escalation in the Enterprise Policies component
CVE-2026-8958Information disclosure, sandbox escape in the Security: Process Sandboxing component
CVE-2026-8959Sandbox escape due to incorrect boundary conditions in the Widget: Win32 component
CVE-2026-8706Sensitive user data could be leaked to other applications through Reader mode
CVE-2026-8961Spoofing issue in the Form Autofill component
CVE-2026-8962Mitigation bypass in the DOM: Security component
CVE-2026-8963Spoofing issue in the Web Speech 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-2026-8971

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