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CVE-2026-3846— Same-origin policy bypass in the CSS Parsing and Computation 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是美国Mozilla基金会的一款开源Web浏览器。 Mozilla Firefox 148.0.2之前版本存在安全漏洞，该漏洞源于CSS解析和计算组件存在同源策略绕过。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1517.001
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I. Basic Information for CVE-2026-3846

Vulnerability Information
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Vulnerability Title
Same-origin policy bypass in the CSS Parsing and Computation component
Source: CVE Program / CVE List V5
Vulnerability Description
Same-origin policy bypass in the CSS Parsing and Computation component. This vulnerability was fixed in Firefox 148.0.2.
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 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox是美国Mozilla基金会的一款开源Web浏览器。 Mozilla Firefox 148.0.2之前版本存在安全漏洞，该漏洞源于CSS解析和计算组件存在同源策略绕过。
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 148.0.2 ~ * -

II. Public POCs for CVE-2026-3846

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III. Intelligence Information for CVE-2026-3846

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Vendor Advisories for CVE-2026-3846 (1)

Same Patch Batch · Mozilla · 2026-03-10 · 3 CVEs total

CVE-2026-3847 Memory safety bugs fixed in Firefox 148.0.2
CVE-2026-3845 Heap buffer overflow in the Audio/Video: Playback component in Firefox for Android

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2026-3846

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