CVE-2026-28871

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-25 · updated 2026-10-26
Weakness: CWE-79

Description

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.

Affected products

Apple iPadOS: before 18.7.7; from 26.0 before 26.4 — fixed in 18.7.7, 26.4
Apple Iphone Os: before 18.7.7; from 26.0 before 26.4 — fixed in 18.7.7, 26.4
Apple macOS: before 26.4 — fixed in 26.4
Apple Safari: before 26.4 — fixed in 26.4
Apple iOS and iPadOS: before 18.7.7; before 26.4 — fixed in 18.7.7, 26.4
Apple macOS: before 26.4 — fixed in 26.4
Apple Safari: before 26.4 — fixed in 26.4

How to fix

Upgrade to a fixed version: Apple iPadOS 18.7.7, 26.4; Apple Iphone Os 18.7.7, 26.4; Apple macOS 26.4; Apple Safari 26.4; Apple iOS and iPadOS 18.7.7, 26.4; Apple macOS 26.4; Apple Safari 26.4. Check the vendor advisory for mitigations.

References

Get alerted when CVE-2026-28871 or the next vulnerability affects your stack