Filename spoofing via Unicode Right-to-Left Override in Firefox for iOS

published 2025-12-18 10 mo ago modified 2026-10-05 34 d ago also EUVD-2025-204291

cvss: 6.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 10%
public exploits: 0; none known

Unicode RTLO characters could allow malicious websites to spoof filenames in the downloads UI for Firefox for iOS, potentially tricking users into saving files of an unexpected file type. This vulnerability was fixed in Firefox for iOS 144.0.

Patch / fix

fixed in 1

mozilla firefox 144.0

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 10 mo ago (2025-12-18)

Exploit prediction

0.21% chance of exploitation in the next 30 days, higher than 10% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CISA ADP	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
CNA	3.1	6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N

Affected products

Mozilla Firefox for iOS

Classification

Weakness

CWE-451 User Interface (UI) Misrepresentation of Critical Information

References

mozilla.org /security/advisories/mfsa2025-97/
vendor-advisory
bugzilla.mozilla.org /show_bug.cgi?id=1984683
permissions-required

Sources

CVE List CVE-2025-14744
NVD CVE-2025-14744

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.

Summary