CVE-2026-8706

Sensitive user data could be leaked to other applications through Reader mode

Medium · published May 19, 2026

CVSS v3.1
6.5
EPSS
0%
Percentile
13.4
In the wild
Unconfirmed
What it 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.

The record
Technical detail
CVSS v3.1
6.5 · MEDIUM
Vector
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
CVSS v4.0
Not supplied
EPSS
0.00233 · 13.4th percentile
Published
2026-05-19T14:27Z
EPSS history
Timeline
  • 19 MAY 14:27Z
    Sensitive user data could be leaked to other applications through Reader mode
    cvelistv5