What is CVE-2026-14906?

CVE-2026-14906 is a medium-severity vulnerability in Mozilla Firefox For iOS, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 5.3/10. Published 2026-07-13.

How severe is CVE-2026-14906?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Arbitrary file upload in Mozilla Firefox For iOS

CVE-2026-14906

Pages with malicious titles could potentially allow saved PDF content to overwrite PDF files or bundled content within the Firefox for iOS application sandbox. This vulnerability was fixed in Firefox for iOS 152.4.

Vulnerability class: Unrestricted File Upload

Published 2026-07-13 · last modified 2026-07-14.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.003 (20.5th percentile), scored 2026-10-24.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 21st percentile — 20.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.003 · newest: 0.003 · change: 0.000

Affected products

Mozilla Firefox For iOS — versions 152.4
Mozilla Firefox Mobile

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

bugzilla.mozilla.org/show_bug.cgi (Permissions Required)
www.mozilla.org/security/advisories/mfsa2026-66/ (Vendor Advisory)

Frequently asked questions

What is CVE-2026-14906?: CVE-2026-14906 is a medium-severity vulnerability in Mozilla Firefox For iOS, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 5.3/10. Published 2026-07-13.
How severe is CVE-2026-14906?: Medium severity. CVSS v3 base score is 5.3 out of 10.