CVE-2026-9078 Firefox iOS RTL Domain Rendering Issue in Link Preview

What is CVE-2026-9078?

CVE-2026-9078 is a medium-severity vulnerability in Mozilla Firefox, published on 25 May 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.

Official 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.

Weakness: CWE-451

Which versions are affected by CVE-2026-9078?

It affects 1 product.

Products include Mozilla Firefox.

How do I fix CVE-2026-9078?

No fix has been published for CVE-2026-9078 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-9078 being exploited?

There is no known exploitation of CVE-2026-9078 in the wild and no public exploit code.

Other vulnerabilities in Mozilla Firefox

• CVE-2019-11708 Mozilla Firefox and Thunderbird Sandbox Escape Exploited Critical 10.0
• CVE-2010-3765 Mozilla Multiple Products Remote Code Execution Exploited Critical 9.8
• CVE-2022-26486 Mozilla Firefox Use-After-Free Exploited Critical 9.6
• CVE-2022-26485 Mozilla Firefox Use-After-Free Exploited High 8.8
• CVE-2019-11707 Mozilla Firefox and Thunderbird Type Confusion Exploited High 8.8

All Mozilla Firefox vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as GHSA-78h4-7j7j-4p28.