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CVE-2025-10531— Mitigation bypass in the Web Compatibility: Tooling 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和Mozilla Thunderbird存在安全漏洞，该漏洞源于Tooling组件允许绕过权限。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.27% · P20

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application
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I. Basic Information for CVE-2025-10531

Vulnerability Information
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Vulnerability Title
Mitigation bypass in the Web Compatibility: Tooling component
Source: CVE Program / CVE List V5
Vulnerability Description
Mitigation bypass in the Web Compatibility: Tooling component. This vulnerability was fixed in Firefox 143 and Thunderbird 143.
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 Thunderbird 安全漏洞
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和Mozilla Thunderbird存在安全漏洞，该漏洞源于Tooling组件允许绕过权限。
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 143 ~ * -
Mozilla Thunderbird 143 ~ * -

II. Public POCs for CVE-2025-10531

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III. Intelligence Information for CVE-2025-10531

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Vendor Advisories for CVE-2025-10531 (2)

Same Patch Batch · Mozilla · 2025-09-16 · 12 CVEs total

CVE-2025-10528 Sandbox escape due to undefined behavior, invalid pointer in the Graphics: Canvas2D compon
CVE-2025-10533 Integer overflow in the SVG component
CVE-2025-10527 Sandbox escape due to use-after-free in the Graphics: Canvas2D component
CVE-2025-10532 Incorrect boundary conditions in the JavaScript: GC component
CVE-2025-10529 Same-origin policy bypass in the Layout component
CVE-2025-10537 Memory safety bugs fixed in Firefox ESR 140.3, Thunderbird ESR 140.3, Firefox 143 and Thun
CVE-2025-10536 Information disclosure in the Networking: Cache component
CVE-2025-10530 Spoofing issue in the WebAuthn component in Firefox for Android
CVE-2025-10535 Information disclosure, mitigation bypass in the Privacy component in Firefox for Android
CVE-2025-10534 Spoofing issue in the Site Permissions component
CVE-2025-10290 Opening links via the contextual menu in Focus for iOS would not update the toolbar UI cor

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2025-10531

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