What is CVE-2026-20638?

CVE-2026-20638 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Improper Access Control. CVSS score: 5.5/10. Published 2026-02-11.

How severe is CVE-2026-20638?

Medium severity. CVSS v3 base score is 5.5 out of 10.

Vulnerability in Apple iOS And Ipados

CVE-2026-20638

A logic issue was addressed with improved checks. This issue is fixed in iOS 26.3 and iPadOS 26.3. A user with Live Caller ID app extensions turned off could have identifying information leaked to the extensions.

Published 2026-02-11 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.001 (3.5th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 3rd percentile — 3.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.001 · newest: 0.001 · change: +0.000

Affected products

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

support.apple.com/en-us/126346 (Release Notes, Vendor Advisory)

Frequently asked questions

What is CVE-2026-20638?: CVE-2026-20638 is a medium-severity vulnerability in Apple iOS And Ipados, classified under Improper Access Control. CVSS score: 5.5/10. Published 2026-02-11.
How severe is CVE-2026-20638?: Medium severity. CVSS v3 base score is 5.5 out of 10.