CVE-2026-9078: Vulnerability in Mozilla Firefox for iOS
Firefox for iOS displayed specially crafted right-to-left (RTL) and internationalized domain names (IDNs) incorrectly in link preview UI surfaces. A crafted RTL hostname could visually reorder portions of the displayed domain, causing attacker-controlled sites to appear as trusted origins. This vulnerability was fixed in Firefox for iOS 151.1.
AI Analysis
Technical Summary
Firefox for iOS incorrectly rendered specially crafted RTL and IDN hostnames in link preview UI surfaces, allowing visual reordering of domain name portions. This could mislead users into trusting attacker-controlled sites by making them appear as legitimate domains. The vulnerability is tracked as CVE-2026-9078 and is associated with CWE-451 (Incorrect Expression of Code or Control Flow). Mozilla fixed this issue in Firefox for iOS 151.1, as documented in their security advisory MFSA 2026-52.
Potential Impact
The vulnerability allows attacker-controlled domains to appear visually as trusted origins in the link preview UI, potentially misleading users. However, the impact is rated low by Mozilla, with no known exploits in the wild and no direct compromise of confidentiality, integrity, or availability beyond visual spoofing.
Mitigation Recommendations
Mozilla fixed this vulnerability in Firefox for iOS version 151.1. Users and administrators should update to Firefox for iOS 151.1 or later to remediate this issue. No additional mitigation actions are required as per the vendor advisory.
CVE-2026-9078: Vulnerability in Mozilla Firefox for iOS
Description
Firefox for iOS displayed specially crafted right-to-left (RTL) and internationalized domain names (IDNs) incorrectly in link preview UI surfaces. A crafted RTL hostname could visually reorder portions of the displayed domain, causing attacker-controlled sites to appear as trusted origins. This vulnerability was fixed in Firefox for iOS 151.1.
CVSS v3.1
Score 5.4medium
Affected software
pkg:github/mozilla/firefox-iosRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
Firefox for iOS incorrectly rendered specially crafted RTL and IDN hostnames in link preview UI surfaces, allowing visual reordering of domain name portions. This could mislead users into trusting attacker-controlled sites by making them appear as legitimate domains. The vulnerability is tracked as CVE-2026-9078 and is associated with CWE-451 (Incorrect Expression of Code or Control Flow). Mozilla fixed this issue in Firefox for iOS 151.1, as documented in their security advisory MFSA 2026-52.
Potential Impact
The vulnerability allows attacker-controlled domains to appear visually as trusted origins in the link preview UI, potentially misleading users. However, the impact is rated low by Mozilla, with no known exploits in the wild and no direct compromise of confidentiality, integrity, or availability beyond visual spoofing.
Mitigation Recommendations
Mozilla fixed this vulnerability in Firefox for iOS version 151.1. Users and administrators should update to Firefox for iOS 151.1 or later to remediate this issue. No additional mitigation actions are required as per the vendor advisory.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- mozilla
- Date Reserved
- 2026-05-20T12:53:12.834Z
- Cvss Version
- null
- State
- PUBLISHED
- Remediation Level
- null
- Vendor Advisory Urls
- [{"url":"https://www.mozilla.org/security/advisories/mfsa2026-52/","vendor":"Mozilla"}]
Threat ID: 6a149bd6a5ae1af1aad7741d
Added to database: 05/25/2026, 18:58:30 UTC
Last enriched: 06/01/2026, 20:45:59 UTC
Last updated: 07/31/2026, 19:23:00 UTC
Views: 155
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