Mozilla Firefox up to 150.x on iOS Hosted Reader Mode information disclosure

Summaryinfo

A vulnerability marked as problematic has been reported in Mozilla Firefox up to 150.x on iOS. Affected by this issue is some unknown functionality of the component Hosted Reader Mode. The manipulation leads to information disclosure. This vulnerability is traded as CVE-2026-8706. It is possible to initiate the attack remotely. There is no exploit available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Mozilla Firefox up to 150.x on iOS and classified as problematic. This issue affects an unknown code of the component Hosted Reader Mode. The manipulation with an unknown input leads to a information disclosure vulnerability. Using CWE to declare the problem leads to CWE-200. The product exposes sensitive information to an actor that is not explicitly authorized to have access to that information. Impacted is confidentiality. The summary by CVE is:

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.

It is possible to read the advisory at bugzilla.mozilla.org. The identification of this vulnerability is CVE-2026-8706 since 05/15/2026. The exploitation is known to be easy. The attack may be initiated remotely. No form of authentication is needed for a successful exploitation. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The pricing for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/24/2026). The attack technique deployed by this issue is T1592 according to MITRE ATT&CK.

The vulnerability scanner Nessus provides a plugin with the ID 316404 (Linux Distros Unpatched Vulnerability : CVE-2026-8706), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 151.0 eliminates this vulnerability.

The vulnerability is also documented in the databases at Tenable (316404) and CERT Bund (WID-SEC-2026-1606). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Affected

• Debian Linux
• Amazon Linux 2
• Red Hat Enterprise Linux
• SUSE Linux
• Oracle Linux
• IGEL OS
• SUSE openSUSE
• RESF Rocky Linux
• Mozilla Firefox
• Mozilla Firefox ESR
• Mozilla Thunderbird

Productinfo

Type

• Web Browser

Vendor

• Mozilla

Name

• Firefox

Version

• 150

License

• open-source

Website

• Vendor: https://www.mozilla.org/
• Product: https://www.mozilla.org/en-US/firefox/

CPE 2.3info

• 🔒

CPE 2.2info

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Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

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