CVE-2026-16349
Same-origin policy bypass in the DOM: Navigation component
- State
- Published
- Severity
- 9.8 Critical
- Published
- Jul 21, 2026
- Updated
- Jul 22, 2026
- Reserved
- Jul 20, 2026
Description
Same-origin policy bypass in the DOM: Navigation component. This vulnerability was fixed in Firefox 153, Firefox ESR 115.38, Firefox ESR 140.13, Thunderbird 153, and Thunderbird 140.13.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 3.1 | 9.8 Critical | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H | CISA-ADP |
Weaknesses
- CWE-346 Origin Validation Error
Affected Products
| Product | Versions |
|---|---|
FirefoxMozilla |
|
ThunderbirdMozilla |
|
References
- https://bugzilla.mozilla.org/show_bug.cgi?id=2034682
- https://www.mozilla.org/security/advisories/mfsa2026-68/
- https://www.mozilla.org/security/advisories/mfsa2026-69/
- https://www.mozilla.org/security/advisories/mfsa2026-70/
- https://www.mozilla.org/security/advisories/mfsa2026-71/
- https://www.mozilla.org/security/advisories/mfsa2026-72/
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