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

Published May 19, 2026
·
Updated

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.

Affected Software

3 affected components
All of the following
Mozilla Firefox=151
Apple iOS
Mozilla Firefox Iphone Os<151.0

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade Firefox for iOS to a version that resolves this vulnerability.

    Fixed in 151.0

Event History

May 19, 2026
CVE Published
via Mozilla·12:00 AM
Data Sourced
via Mozilla·12:00 AM
DescriptionSeverityAffected Software
CVE Published
via MITRE·02:27 PM
Data Sourced
via MITRE·02:27 PM
Description
Data Sourced
via NVD·04:16 PM
DescriptionSeverityWeaknessAffected Software
Jun 29, 58424
Event
via FIRST·12:40 PM

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

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Frequently Asked Questions

1

What is the severity of CVE-2026-8706?

CVE-2026-8706 has a severity rating of medium with a CVSS score of 6.5.

2

How do I fix CVE-2026-8706?

To mitigate CVE-2026-8706, update to the latest version of Mozilla Firefox for iOS where the vulnerability has been patched.

3

What types of data are potentially leaked by CVE-2026-8706?

CVE-2026-8706 allows sensitive user data, such as cookies, to be leaked to other applications.

4

Who is affected by CVE-2026-8706?

CVE-2026-8706 affects users of Mozilla Firefox on iOS who utilize the Reader mode feature.

5

How does CVE-2026-8706 exploit sensitive user data?

CVE-2026-8706 exploits an unauthenticated local web server to enable other applications to access URLs using the signed-in user's cookies.

Company

Resources

Contact

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