CVE-2025-6425— The WebCompat WebExtension shipped with Firefox exposed a persistent UUID
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I. Basic Information for CVE-2025-6425
Vulnerability Information
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Vulnerability Title
The WebCompat WebExtension shipped with Firefox exposed a persistent UUID
Source: NVD (National Vulnerability Database)
Vulnerability Description
An attacker who enumerated resources from the WebCompat extension could have obtained a persistent UUID that identified the browser, and persisted between containers and normal/private browsing mode, but not profiles. This vulnerability was fixed in Firefox 140, Firefox ESR 115.25, 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和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。 Mozilla Firefox 140之前版本和Mozilla Firefox ESR 115.25之前版本、128.12之前版本存在安全漏洞，该漏洞源于WebCompat扩展存在缺陷，可能导致浏览器UUID泄露。
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 | 115.25 ~ 115.* | - | |
| Mozilla | Thunderbird | 128.12 ~ 128.* | - |
II. Public POCs for CVE-2025-6425
| # | POC Description | Source Link | Shenlong Link |
|---|
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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-2025-6429 | Incorrect parsing of URLs could have allowed embedding of youtube.com | |
| 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 |
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-2025-6425
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