CVE-2025-6429
Last modified
CVE-2025-6429 is a medium-severity vulnerability rated 6.5/10 on the CVSS scale. 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. EPSS estimates a 0.29% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Weakness Enumeration
Affected Software
| Vendor | Product | Versions |
|---|---|---|
| Mozilla | Firefox | < 128.12.0 |
| Mozilla | Firefox | < 140.0 |
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=1970658Permissions Required
- https://www.mozilla.org/security/advisories/mfsa2025-51/Vendor Advisory
- https://www.mozilla.org/security/advisories/mfsa2025-53/Vendor Advisory
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2025-6429?
How severe is CVE-2025-6429?
How do I fix CVE-2025-6429?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2025
- CVE-2025-64284Improper Control of Filename for Include/Require Statement i…7.5
- CVE-2025-64285Missing Authorization vulnerability in Premmerce Premmerce W…5.4
- CVE-2025-64286Cross-Site Request Forgery (CSRF) vulnerability in WpEstate …4.3
- CVE-2025-64287Improper Control of Filename for Include/Require Statement i…8.1
- CVE-2025-64288Cross-Site Request Forgery (CSRF) vulnerability in Premmerce…4.3
- CVE-2025-64289Improper Neutralization of Input During Web Page Generation …5.9
- CVE-2025-64290Cross-Site Request Forgery (CSRF) vulnerability in Premmerce…4.3
- CVE-2025-64291Improper Neutralization of Input During Web Page Generation …5.9
- CVE-2025-64292Improper Neutralization of Input During Web Page Generation …6.5
- CVE-2025-64293Improper Neutralization of Special Elements used in an SQL C…7.6
- CVE-2025-64294Missing Authorization vulnerability in d3wp WP Snow Effect w…5.3
- CVE-2025-64295Insertion of Sensitive Information Into Sent Data vulnerabil…6.5
Are you affected by CVE-2025-6429?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST