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Intro
CVE-2026-9078 is a UI misrepresentation vulnerability (CWE-451) affecting versions of Firefox for iOS before 151.1. The flaw resides in how the browser renders specially crafted right-to-left (RTL) and internationalized domain names (IDNs) within link preview UI surfaces. When a user shares a link, Firefox displays a domain preview; the vulnerable component fails to correctly normalize the visual ordering of bidi (bidirectional) text.
RTL scripts (e.g., Arabic, Hebrew) reorder characters automatically. By injecting a contrived RTL hostname containing a “” (U+202E) or similar directional override character, an attacker can reorder the visual sequence of the domain string. This enables an attacker to place a malicious domain suffix earlier in the visual order, causing the UI to render the attacker’s domain as if it were a trusted origin (e.g., showing `secure‑bank.com-attacker.net` as `secure‑bank.com` in preview).
The issue is classified as a “user interface (UI) misrepresentation of critical information” because the UI fails to accurately communicate the true origin of the link. The attacker does not need to bypass TLS; the spoof occurs purely in the rendering layer. The vulnerability was fixed in Firefox for iOS 151.1 by enforcing proper display of IDNs and RTL strings in link previews, aligning with the behavior used in the address bar. The patch effectively neutralizes the visual reordering by detecting and escaping bidirectional characters in the preview context.
DailyCVE Form:
Platform: iOS
Version: <151.1
Vulnerability : UI Spoofing
Severity: Medium (4.3)
date: 2026‑05‑25
Prediction: Already patched (151.1)
What Undercode Say:
Analytics
- Attack Vector: Remote, user interaction required
- CVSS v3: 4.3 (AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N)
- EPSS Score: 0.7% (low likelihood)
Bash Commands & Codes
Check affected iOS Firefox version defaults read /Applications/Firefox.app/Contents/Info CFBundleShortVersionString Verify update to 151.1 curl -s https://update.mozilla.org/check | grep "151.1"
Exploit:
1. Register domain `secure-bank.com-attacker.net` (RTL override).
2. Send link to victim via iMessage/email.
- Victim long‑presses link → Firefox preview displays
secure-bank.com.
4. Victim clicks, lands on attacker site.
Protection:
- Upgrade: Install Firefox for iOS 151.1 from App Store.
- Hardening: Enable “Show full domain” in Settings → Security.
- User awareness: Manually verify destination before tapping links.
Impact:
A remote attacker can bypass origin security indicators, facilitating phishing, credential theft, and site spoofing without cryptographic compromise.
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Sources:
Reported By: nvd.nist.gov
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