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CVE-2026-8706

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

Published: May 19, 2026Updated: May 20, 2026 Sources: CVE List NVDCWE-200
NVD MITRE
6.5CVSSMEDIUM
EPSS Score
0.2%
Top 91.1%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

CVSS Vector Breakdown

AV:AAC:LPR:NUI:NS:UC:HI:NA:N
Exploitability
AV:AAttack Vector
Adjacent
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:NIntegrity
None
A:NAvailability
None
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Weaknesses

CWE-200CWE-306

Affected Products

Firefox for iOSMozilla
On-premDesktop App
Consumer Software / browser
firefoxmozilla
On-premDesktop App
Consumer Software / browser
mozillaoss-projectUSConsumer Softwareaka mozilla corp.

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

3 techniques
Collection
Initial Access
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References

https://bugzilla.mozilla.org/show_bug.cgi?id=2036618
bugzilla.mozilla.org
https://www.mozilla.org/security/advisories/mfsa2026-49/
mozilla.org

Timeline

Published
May 19, 2026
Last Updated
May 20, 2026

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