CVE-2026-8706: Firefox for iOS hosted Reader mode on an unauthenticated local web server, allowing another application on the

Q: How do I fix CVE-2026-8706?

firefox: upgrade to 151.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-8706 being exploited?

CVE-2026-8706 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-8706 affect?

CVE-2026-8706 affects firefox. Severity is medium (CVSS 6.5). 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

Q: How urgent is CVE-2026-8706?

Priority 25/100. No elevated risk signals yet.

Routine

MEDIUM 6.5UPGRADE

CVE-2026-8706 is a medium-severity flaw (CVSS 6.5) affecting firefox. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Adjacent network
Attack complexity	Low
Privileges needed	None
User interaction	None
EPSS exploit chance	0.2% (top 91%)
CISA exploited list	No
Weakness	CWE-200, CWE-306
Published	2026-05-19
Last modified	2026-07-23

Publisher (CNA): Mozilla Corporation · Vendor: mozilla

Last updated 2026-07-23 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-19 16:16 UTCPublished CVE record published
2026-07-23 20:10 UTCUpdated Record last modified

mozilla firefox UPGRADE

Affected: < 151.0

Fixed in: 151.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy firefox || rpm -q firefox || firefox --version

2. UPGRADE to 151.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade firefox

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade firefox

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-8706?

firefox: upgrade to 151.0. Exact commands for each OS are on this page.

Is CVE-2026-8706 being exploited?

CVE-2026-8706 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-8706 affect?

CVE-2026-8706 affects firefox. Severity is medium (CVSS 6.5). 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

How urgent is CVE-2026-8706?

Priority 25/100. No elevated risk signals yet.

Software pages

iOS vulnerabilities · Mozilla Firefox vulnerabilities

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References

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