CVE-2026-13356: A malicious webpage could interrupt a pending navigati
CVE-2026-13356 analysis covering impact, affected products, versions, remediation, and cross-checked defender guidance.
CVE-2026-13356 is a vulnerability published by NVD on 7/7/2026.
What happened
A malicious webpage could interrupt a pending navigation by enqueuing a synchronous JavaScript dialog, causing the browser UI to display the destination origin in the address bar while continuing to render attacker-controlled content. This vulnerability was fixed in Firefox for iOS 152.3.
Affected products and versions
- mozilla firefox unspecified version (before 152.3)
Severity and weakness
CVSS: MEDIUM 6.3. Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L.
Weaknesses: CWE-451.
Known exploitation
No CISA KEV entry is currently attached to the NVD record.
What defenders should do
- Identify whether the affected product and version range exists in production.
- Review vendor advisories and release notes before change windows.
- Patch, upgrade, disable the vulnerable component, or apply vendor mitigations.
- Verify the running version after deployment, not only the package inventory.