Improper input validation in Apple iOS And Ipados
CVE-2026-20643
A cross-origin issue in the Navigation API was addressed with improved input validation. This issue is fixed in Background Security Improvements for iOS, iPadOS, and macOS, Safari 26.4, iOS 18.7.7 and iPadOS 18.7.7, iOS 26.4 and iPadOS 26.4, macOS Tahoe 26.4, visionOS 26.4. Processing maliciously crafted web content may bypass Same Origin Policy.
Vulnerability class: Drupalgeddon 2 (CVE-2018-7600)
Published · last modified .
CVSS v3 metric
CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.
EPSS exploit prediction
EPSS: 0.004 (26.7th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 27th percentile — 26.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000
Affected products
- Apple iOS And Ipados — versions 0
- Apple Ipados
- Apple Iphone OS
- Apple macOS — versions 0
- Apple Safari — versions 0
- Apple Visionos — versions 0
Weakness classification (CWE)
Public proof-of-concept exploits
References
Frequently asked questions
- What is CVE-2026-20643?
- CVE-2026-20643 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Improper Input Validation. CVSS score: 5.4/10. Published 2026-03-17.
- How severe is CVE-2026-20643?
- Medium severity. CVSS v3 base score is 5.4 out of 10.
- Is CVE-2026-20643 known to be exploited?
- 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.