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Fencer Intel
medium 5.4

CVE-2026-20643 json

A cross-origin issue in the Navigation API was addressed with improved input validation.

published 7mo ago modified 14d ago also EUVD-2026-12663

cvss
5.4
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.4%
EPSS 0.4% chance of exploitation in 30 days, percentile 30%
public exploits
0
none known

Summary

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.

Patch / fix

  • Apple Safari 26.4
  • Apple iOS and iPadOS 18.7.7, 26.3.1 (a), 26.4
  • Apple macOS 26.3.1 (a), 26.3.2 (a), 26.4
  • Apple visionOS 26.4
  • wpewebkit Debian 14 2.52.1-1
  • webkit2gtk Debian 13 2.52.3-2~deb13u1
  • webkit2gtk Debian 14 2.52.1-1

debian advisories DEBIAN-CVE-2026-20643

  • webkit2gtk Ubuntu 24.04 LTS 2.52.3-0ubuntu0.24.04.1
  • webkit2gtk Ubuntu 25.10 2.52.3-0ubuntu0.25.10.1
  • webkit2gtk Ubuntu 26.04 LTS 2.52.3-0ubuntu0.26.04.2

ubuntu advisories UBUNTU-CVE-2026-20643

Ubuntu security data © Canonical Ltd., from https://github.com/canonical/ubuntu-security-notices via OSV; changed: normalised to fixed package versions per release. CC BY-SA 4.0

  • webkit2gtk3 RHEL 9 2.52.3-1.el9_8
  • webkit2gtk3-jsc RHEL 9 2.52.3-1.el9_8
  • webkit2gtk3 RHEL 8 2.52.3-1.el8_10
  • webkit2gtk3-jsc RHEL 8 2.52.3-1.el8_10
  • webkit2gtk3 RHEL 9 2.52.3-0.el9_7.1
  • webkit2gtk3-jsc RHEL 9 2.52.3-0.el9_7.1
  • webkitgtk4 RHEL 7 ELS 2.52.3-1.el7_9
  • webkitgtk4-jsc RHEL 7 ELS 2.52.3-1.el7_9

red hat advisories RHSA-2026:22136RHSA-2026:19535RHSA-2026:19206RHSA-2026:16695RHSA-2026:16056RHSA-2026:14659

  • webkit2gtk3 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Desktop Applications 15 SP7 +1 more 2.52.1-150600.12.63.1
  • webkit2gtk4 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Development Tools 15 SP7 +2 more 2.52.1-150600.12.63.1
  • webkit2gtk3-soup2 SLES for SAP 15 SP6, SLES 15 SP6-LTSS, SLE Module for Basesystem 15 SP7 +1 more 2.52.1-150600.12.63.1
  • webkit2gtk3 SLES for SAP applications 16.0, SLES 16.0 2.52.1-160000.1.1
  • webkit2gtk4 SLES for SAP applications 16.0, SLES 16.0 2.52.1-160000.1.1

suse advisories SUSE-SU-2026:1364-1SUSE-SU-2026:21180-1

  • webkit2gtk3 openSUSE Leap 16.0 2.52.1-160000.1.1
  • webkit2gtk4 openSUSE Leap 16.0 2.52.1-160000.1.1
  • webkit2gtk3-soup2 openSUSE Leap 16.0 2.52.1-160000.1.1

opensuse advisories openSUSE-SU-2026:20518-1

  • webkit2gtk3 AlmaLinux 9 2.52.3-1.el9_8
  • webkit2gtk3-jsc AlmaLinux 9 2.52.3-1.el9_8
  • webkit2gtk3 AlmaLinux 8 2.52.3-1.el8_10
  • webkit2gtk3-jsc AlmaLinux 8 2.52.3-1.el8_10
  • webkit2gtk3 AlmaLinux 9 2.52.3-0.el9_7.1
  • webkit2gtk3-jsc AlmaLinux 9 2.52.3-0.el9_7.1

almalinux advisories ALSA-2026:19206ALSA-2026:10702ALSA-2026:9692

  • webkit2gtk3 Rocky Linux 9 2.52.3-1.el9_8
  • webkit2gtk3 Rocky Linux 8 2.52.3-1.el8_10
  • webkit2gtk3 Rocky Linux 9 2.52.3-0.el9_7.1

rocky linux advisories RLSA-2026:19206RLSA-2026:10702RLSA-2026:9692

Is CVE-2026-20643 in your stack? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

Check with Fencer

Vendor advisories

What the vendors themselves say about their products: affected, fixed or not affected, and what to do.

red hat product security vex CVE-2026-20643 updated cvss 5.4

webkitgtk: Processing maliciously crafted web content may bypass Same Origin Policy

  • Red Hat Enterprise Linux 6 webkitgtk
    affected: workaround, no fix planned “Out of support scope”
  • Red Hat Enterprise Linux AppStream (v. 8) webkit2gtk3 2.52.3-1.el8_10, webkit2gtk3-jsc 2.52.3-1.el8_10
    fixed: vendor fix RHSA-2026:10702
  • Red Hat Enterprise Linux AppStream (v. 9) webkit2gtk3 2.52.3-1.el9_8, webkit2gtk3 2.52.3-0.el9_7.1, webkit2gtk3-jsc 2.52.3-1.el9_8, webkit2gtk3-jsc 2.52.3-0.el9_7.1
    fixed: vendor fix RHSA-2026:9692
  • Red Hat Enterprise Linux AppStream AUS (v.8.4) webkit2gtk3 2.52.3-1.el8_4, webkit2gtk3-jsc 2.52.3-1.el8_4
    fixed: vendor fix RHSA-2026:16056
  • Red Hat Enterprise Linux AppStream AUS (v.8.6) webkit2gtk3 2.52.3-1.el8_6, webkit2gtk3-jsc 2.52.3-1.el8_6 Red Hat Enterprise Linux AppStream E4S (v.8.6) webkit2gtk3 2.52.3-1.el8_6, webkit2gtk3-jsc 2.52.3-1.el8_6
    fixed: vendor fix RHSA-2026:13845
  • Red Hat Enterprise Linux AppStream E4S (v.8.8) webkit2gtk3 2.52.3-1.el8_8, webkit2gtk3-jsc 2.52.3-1.el8_8
    fixed: vendor fix RHSA-2026:11814
  • Red Hat Enterprise Linux AppStream E4S (v.9.0) webkit2gtk3 2.52.3-1.el9_0, webkit2gtk3-jsc 2.52.3-1.el9_0
    fixed: vendor fix RHSA-2026:19535
  • Red Hat Enterprise Linux AppStream E4S (v.9.2) webkit2gtk3 2.52.3-1.el9_2, webkit2gtk3-jsc 2.52.3-1.el9_2
    fixed: vendor fix RHSA-2026:16695
show 7 more
  • Red Hat Enterprise Linux AppStream EUS (v.9.4) webkit2gtk3 2.52.3-1.el9_4, webkit2gtk3-jsc 2.52.3-1.el9_4
    fixed: vendor fix RHSA-2026:14659
  • Red Hat Enterprise Linux AppStream EUS (v.9.6) webkit2gtk3 2.52.3-1.el9_6, webkit2gtk3-jsc 2.52.3-1.el9_6
    fixed: vendor fix RHSA-2026:11329
  • Red Hat Enterprise Linux AppStream EUS EXTENSION (v.8.4) webkit2gtk3 2.52.3-1.el8_4, webkit2gtk3-jsc 2.52.3-1.el8_4
    fixed: vendor fix RHSA-2026:16056
  • Red Hat Enterprise Linux AppStream TUS (v.8.6) webkit2gtk3 2.52.3-1.el8_6, webkit2gtk3-jsc 2.52.3-1.el8_6
    fixed: vendor fix RHSA-2026:13845
  • Red Hat Enterprise Linux AppStream TUS (v.8.8) webkit2gtk3 2.52.3-1.el8_8, webkit2gtk3-jsc 2.52.3-1.el8_8
    fixed: vendor fix RHSA-2026:11814
  • Red Hat Enterprise Linux Server (v. 7 ELS) webkitgtk4 2.52.3-1.el7_9, webkitgtk4-jsc 2.52.3-1.el7_9 Red Hat Enterprise Linux Server Optional (v. 7 ELS) webkitgtk4-doc 2.52.3-1.el7_9, webkitgtk4-devel 2.52.3-1.el7_9, webkitgtk4-debuginfo 2.52.3-1.el7_9, webkitgtk4-jsc-devel 2.52.3-1.el7_9
    fixed: vendor fix RHSA-2026:22136
  • Red Hat Enterprise Linux 7 webkitgtk3, libwebkit2gtk
    not affected: vulnerable code not present

Red Hat CSAF VEX © Red Hat, Inc., from https://security.access.redhat.com/data/csaf/v2/vex/; changed: reduced to product statuses and remediations. CC BY 4.0 · csaf

CISA SSVC

Exploitation
none
Automatable
no
Technical impact
partial
Assessed
7mo ago

Exploit prediction

0.37% chance of exploitation in the next 30 days, higher than 30% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CISA ADP 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
CNA 3.1 5.4 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N

Affected products

  • Apple Safari
  • Apple iOS and iPadOS
  • Apple macOS
  • Apple visionOS

Classification

Weakness
  • CWE-20 Improper Input Validation
  • CWE-346 Origin Validation Error

References

Sources

Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.