CVE-2026-28871: A logic issue was addressed with improved checks

Q: How do I fix CVE-2026-28871?

safari: upgrade to 26.4; ipados: upgrade to 18.7.7, 26.4; iphone os: upgrade to 18.7.7, 26.4. Exact commands for each OS are on this page.

Q: Is CVE-2026-28871 being exploited?

CVE-2026-28871 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-2026-28871 affect?

CVE-2026-28871 affects safari, ipados, iphone os. Severity is medium (CVSS 4.3). A logic issue was addressed with improved checks. This issue is fixed in Safari 26.4, iOS 18.7.7 and iPadOS 18.7.7, iOS 26.4 and iPadOS 26.4, macOS Tahoe 26.4. Visiting a maliciously crafted website may lead to a cross-site scripting attack

Q: How urgent is CVE-2026-28871?

Priority 20/100. No elevated risk signals yet.

Routine

MEDIUM 4.3UPGRADEUPGRADEUPGRADE

CVE-2026-28871 is a medium-severity flaw (CVSS 4.3) affecting safari, ipados, iphone os. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

A logic issue was addressed with improved checks. This issue is fixed in Safari 26.4, iOS 18.7.7 and iPadOS 18.7.7, iOS 26.4 and iPadOS 26.4, macOS Tahoe 26.4. Visiting a maliciously crafted website may lead to a cross-site scripting attack.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	4.3 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 79%)
CISA exploited list	No
Weakness	CWE-79
Published	2026-03-25
Last modified	2026-06-17

Publisher (CNA): Apple Inc. · Vendor: apple

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-03-25 01:17 UTCPublished CVE record published
2026-06-17 10:29 UTCUpdated Record last modified

apple safari UPGRADE

Affected: < 26.4

Fixed in: 26.4

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 26.4 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade safari

Note

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

apple ipados UPGRADE

Affected: < 18.7.7 · >= 26.0 and < 26.4

Fixed in: 18.7.7, 26.4

Safe to downgrade to: a release before 26.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

apple iphone os UPGRADE

Affected: < 18.7.7 · >= 26.0 and < 26.4

Fixed in: 18.7.7, 26.4

Safe to downgrade to: a release before 26.0

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

apple macos UPGRADE

Affected: < 26.4

Fixed in: 26.4

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

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-2026-28871?

safari: upgrade to 26.4; ipados: upgrade to 18.7.7, 26.4; iphone os: upgrade to 18.7.7, 26.4. Exact commands for each OS are on this page.

Is CVE-2026-28871 being exploited?

CVE-2026-28871 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-2026-28871 affect?

CVE-2026-28871 affects safari, ipados, iphone os. Severity is medium (CVSS 4.3). A logic issue was addressed with improved checks. This issue is fixed in Safari 26.4, iOS 18.7.7 and iPadOS 18.7.7, iOS 26.4 and iPadOS 26.4, macOS Tahoe 26.4. Visiting a maliciously crafted website may lead to a cross-site scripting attack

How urgent is CVE-2026-28871?

Priority 20/100. No elevated risk signals yet.

Software pages

iOS vulnerabilities · macOS vulnerabilities · Safari vulnerabilities · Apple Safari and WebKit vulnerabilities · iPadOS vulnerabilities

Related CVEs

CVE-2026-43715 HIGH 8.8 UPGRADE UPGRADE A use-after-free issue was addressed with improved memory management
CVE-2026-86898 MEDIUM 5.4 UPGRADE UPGRADE A logic issue was addressed with improved state management
CVE-2026-84635 MEDIUM 6.5 UPGRADE UPGRADE A logic issue was addressed with improved state management
CVE-2026-86897 MEDIUM 5.5 UPGRADE UPGRADE This issue was addressed with additional entitlement checks
CVE-2026-65390 HIGH 8.8 UPGRADE UPGRADE An integer overflow was addressed with improved input validation

References

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