CVE-2026-8706 Sensitive user data could be leaked to other applications through Reader mode

What is CVE-2026-8706?

CVE-2026-8706 is a medium-severity vulnerability in Mozilla Firefox, published on 19 May 2026. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

Firefox for iOS hosted Reader mode on an unauthenticated local web server, allowing another application on the same device to request arbitrary URLs and receive the response rendered with the signed-in user's cookies. This vulnerability was fixed in Firefox for iOS 151.0.

Weakness: CWE-306, CWE-200

Which versions are affected by CVE-2026-8706?

It affects 1 product.

Products include Mozilla Firefox.

How do I fix CVE-2026-8706?

No fix has been published for CVE-2026-8706 yet. Limit exposure of the affected software until one is available.

Is CVE-2026-8706 being exploited?

There is no known exploitation of CVE-2026-8706 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-4c2h-7p75-v7hg, UBUNTU-CVE-2026-8706.