Quick answers
- Is CVE-2026-8706 exploited in the wild?
- No. Junglewise Threat Intelligence has no report of CVE-2026-8706 being exploited in the wild.
- How severe is CVE-2026-8706?
- Informational severity, published 19 May 2026.
- Which products and versions are affected?
- Mozilla Firefox for iOS versions prior to 151.0.
- Is there a fix for CVE-2026-8706?
- A patch was published on 2026-05-19: Fixed in Firefox for iOS 151.0 Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
- How is CVE-2026-8706 attacked?
- It is attacked with local access, in a network appliance.
- Am I affected by CVE-2026-8706?
- Check whether you run Mozilla Firefox for iOS at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.
Technical details
Firefox for iOS implemented its Reader mode by hosting a local, unauthenticated web server on the device. Because this server lacked authentication or origin checks, any other application residing on the same iOS device could send requests to it. An attacker-controlled app could leverage this to request arbitrary URLs through the Reader mode interface. The local server would then fetch and render these pages using the user's active session cookies, effectively allowing the malicious app to bypass same-origin protections and exfiltrate sensitive data from the user's authenticated web sessions. This issue was addressed in Firefox for iOS version 151.0.
Affected products
- Mozilla Firefox for iOS versions prior to 151.0
Timeline
- 2026-05-19: disclosed
- 2026-05-19: advisory
- 2026-05-19: patched: Fixed in Firefox for iOS 151.0