CVE-2025-6429— Incorrect parsing of URLs could have allowed embedding of youtube.com
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I. Basic Information for CVE-2025-6429
Vulnerability Information
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Vulnerability Title
Incorrect parsing of URLs could have allowed embedding of youtube.com
Source: NVD (National Vulnerability Database)
Vulnerability Description
Firefox could have incorrectly parsed a URL and rewritten it to the youtube.com domain when parsing the URL specified in an `embed` tag. This could have bypassed website security checks that restricted which domains users were allowed to embed. This vulnerability was fixed in Firefox 140, Firefox ESR 128.12, Thunderbird 140, and Thunderbird 128.12.
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,Mozilla Firefox ESR 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Mozilla Firefox和Mozilla Firefox ESR都是美国Mozilla基金会的产品。Mozilla Firefox是一款开源Web浏览器。Mozilla Firefox ESR是Firefox(Web浏览器)的一个延长支持版本。 Firefox 140之前版本和Firefox ESR 128.12之前版本存在安全漏洞，该漏洞源于URL解析存在缺陷，可能导致安全绕过。
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 | 128.12 ~ 128.* | - | |
| Mozilla | Thunderbird | 128.12 ~ 128.* | - |
II. Public POCs for CVE-2025-6429
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|---|
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Same Patch Batch · Mozilla · 2025-06-24 · 13 CVEs total
| CVE-2025-6435 | Save as in Devtools could download files without sanitizing the extension | |
| CVE-2025-6436 | Memory safety bugs fixed in Firefox 140 and Thunderbird 140 | |
| CVE-2025-6432 | DNS Requests leaked outside of a configured SOCKS proxy | |
| CVE-2025-6434 | HTTPS-Only exception screen lacked anti-clickjacking delay | |
| CVE-2025-6433 | WebAuthn would allow a user to sign a challenge on a webpage with an invalid TLS certifica | |
| CVE-2025-6431 | The prompt in Firefox for Android that asks before opening a link in an external applicati | |
| CVE-2025-6428 | Firefox for Android opened URLs specified in a link querystring parameter | |
| CVE-2025-6430 | Content-Disposition header ignored when a file is included in an embed or object tag | |
| CVE-2025-6427 | connect-src Content Security Policy restriction could be bypassed | |
| CVE-2025-6426 | No warning when opening executable terminal files on macOS | |
| CVE-2025-6424 | Use-after-free in FontFaceSet | |
| CVE-2025-6425 | The WebCompat WebExtension shipped with Firefox exposed a persistent UUID |
IV. Related Vulnerabilities
Same product: Firefox
- CVE-2026-8093
Memory safety bugs fixed in Thunderbird 150.0.2 - CVE-2026-8094
Other issue in the WebRTC component - CVE-2026-8092
Memory safety bugs fixed in Thunderbird ESR 140.10.2 and Thu - CVE-2026-8091
Incorrect boundary conditions in the Audio/Video: Playback c - CVE-2026-8090
Use-after-free in the DOM: Networking component
Same vendor: Mozilla
- CVE-2026-8093
Memory safety bugs fixed in Thunderbird 150.0.2 - CVE-2026-8094
Other issue in the WebRTC component - CVE-2026-8092
Memory safety bugs fixed in Thunderbird ESR 140.10.2 and Thu - CVE-2026-8091
Incorrect boundary conditions in the Audio/Video: Playback c - CVE-2026-8090
Use-after-free in the DOM: Networking component
V. Comments for CVE-2025-6429
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