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CVE-2026-12304— Same-origin policy bypass in the Networking: Cookies component

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是Mozilla基金会开源的一款Web浏览器。 Mozilla Firefox 152之前版本和Firefox ESR 140.12之前版本以及Thunderbird 152之前版本和Thunderbird 140.12之前版本存在输入验证错误漏洞，该漏洞源于Networking: Cookies组件存在同源策略绕过，可能导致未经身份验证的攻击者通过网络访问，造成机密性和完整性影响。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1135 · Network Share Discovery

Affected Version Matrix 4

VendorProduct Version RangeStatus
Mozilla Firefox 140.12≤ 140.* unaffected
152≤ * unaffected
Mozilla Thunderbird 140.12≤ 140.* unaffected
152≤ * unaffected
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I. Basic Information for CVE-2026-12304

Vulnerability Information
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Vulnerability Title
Same-origin policy bypass in the Networking: Cookies component
Source: CVE Program / CVE List V5
Vulnerability Description
Same-origin policy bypass in the Networking: Cookies component. This vulnerability was fixed in Firefox 152, Firefox ESR 140.12, Thunderbird 152, and Thunderbird 140.12.
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 输入验证错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox是Mozilla基金会开源的一款Web浏览器。 Mozilla Firefox 152之前版本和Firefox ESR 140.12之前版本以及Thunderbird 152之前版本和Thunderbird 140.12之前版本存在输入验证错误漏洞，该漏洞源于Networking: Cookies组件存在同源策略绕过，可能导致未经身份验证的攻击者通过网络访问，造成机密性和完整性影响。
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 140.12 ~ 140.* -
Mozilla Thunderbird 140.12 ~ 140.* -

II. Public POCs for CVE-2026-12304

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III. Intelligence Information for CVE-2026-12304

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Vendor Advisories for CVE-2026-12304 (4)

Same Patch Batch · Mozilla · 2026-06-16 · 44 CVEs total

CVE-2026-12300 Memory safety bug fixed in Firefox 152
CVE-2026-12297 Sandbox escape due to incorrect boundary conditions in the Networking component
CVE-2026-12298 Memory safety bug fixed in Firefox 152
CVE-2026-12296 Sandbox escape in the Security: Process Sandboxing component
CVE-2026-12293 Use-after-free in the Graphics: WebGPU component
CVE-2026-12292 Incorrect boundary conditions in the Web Audio component
CVE-2026-12291 Use-after-free in the Networking: HTTP component
CVE-2026-12290 Memory safety bug fixed in Firefox 152
CVE-2026-12289 Privilege escalation in the Graphics: WebRender component
CVE-2026-12294 Sandbox escape in the DOM: Workers component
CVE-2026-12299 JIT miscompilation in the DOM: Core & HTML component
CVE-2026-12301 Memory safety bug fixed in Firefox 152
CVE-2026-12302 Mitigation bypass in the DOM: Security component
CVE-2026-12303 Information disclosure due to incorrect boundary conditions in the Graphics: WebGPU compon
CVE-2026-12305 Memory safety bug fixed in Firefox 152
CVE-2026-12306 Memory safety bug fixed in Firefox 152
CVE-2026-12307 Memory safety bug fixed in Firefox 152
CVE-2026-12308 Memory safety bug fixed in Firefox 152
CVE-2026-12309 Memory safety bug fixed in Firefox 152
CVE-2026-12310 Memory safety bug fixed in Firefox 152

Showing top 20 of 44 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2026-12304

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