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CVE-2025-11712— An OBJECT tag type attribute overrode browser behavior on web resources without a content-type

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OBJECT标签的type属性可能覆盖默认浏览器行为，可能导致跨站脚本攻

AI Predicted 5.3 Difficulty: Moderate EPSS 0.26% · P17
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I. Basic Information for CVE-2025-11712

Vulnerability Information
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Vulnerability Title
An OBJECT tag type attribute overrode browser behavior on web resources without a content-type
Source: CVE Program / CVE List V5
Vulnerability Description
A malicious page could have used the type attribute of an OBJECT tag to override the default browser behavior when encountering a web resource served without a content-type. This could have contributed to an XSS on a site that unsafely serves files without a content-type header. This vulnerability was fixed in Firefox 144, Firefox ESR 140.4, Thunderbird 144, and Thunderbird 140.4.
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OBJECT标签的type属性可能覆盖默认浏览器行为，可能导致跨站脚本攻
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 140.4 ~ 140.* -
Mozilla Thunderbird 140.4 ~ 140.* -

II. Public POCs for CVE-2025-11712

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III. Intelligence Information for CVE-2025-11712

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Vendor Advisories for CVE-2025-11712 (4)

Same Patch Batch · Mozilla · 2025-10-14 · 14 CVEs total

CVE-2025-11711 Some non-writable Object properties could be modified
CVE-2025-11710 Cross-process information leaked due to malicious IPC messages
CVE-2025-11709 Out of bounds read/write in a privileged process triggered by WebGL textures
CVE-2025-11714 Memory safety bugs fixed in Firefox ESR 115.29, Firefox ESR 140.4, Thunderbird ESR 140.4,
CVE-2025-11708 Use-after-free in MediaTrackGraphImpl::GetInstance()
CVE-2025-11715 Memory safety bugs fixed in Firefox ESR 140.4, Thunderbird ESR 140.4, Firefox 144 and Thun
CVE-2025-11713 Potential user-assisted code execution in “Copy as cURL” command
CVE-2025-11721 Memory safety bug fixed in Firefox 144 and Thunderbird 144
CVE-2025-11719 Use-after-free caused by the native messaging web extension API on Windows
CVE-2025-11716 Sandboxed iframes allowed links to open in external apps (Android only)
CVE-2025-11720 Spoofing risk in Android custom tabs
CVE-2025-11717 The password edit screen was not hidden in Android card view
CVE-2025-11718 Address bar could be spoofed on Android using visibilitychange

IV. Related Vulnerabilities

Same product: Firefox
Same vendor: Mozilla

V. Comments for CVE-2025-11712

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