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Fencer Intel
medium 4.3

CVE-2026-28871 json

A logic issue was addressed with improved checks.

published 7mo ago modified 14d ago also EUVD-2026-15149

cvss
4.3
version 3.1, CNA
cisa kev
Not listed
not in CISA's catalog
epss
0.3%
EPSS 0.3% chance of exploitation in 30 days, percentile 21%
public exploits
0
none known

Summary

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.

Patch / fix

  • Apple Safari 26.4
  • Apple iOS and iPadOS 18.7.7, 26.4
  • Apple macOS 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-2026-28871

  • 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-2026-28871

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-2026-28871 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-2026-28871 updated cvss 4.3

webkitgtk: Visiting a maliciously crafted website may lead to a cross-site scripting attack

  • 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

0.29% chance of exploitation in the next 30 days, higher than 21% of all scored CVEs (FIRST EPSS, 2026-11-09).

CVSS scores

assigned by version score vector
CISA ADP 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
CNA 3.1 4.3 CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

Affected products

  • Apple Safari
  • Apple iOS and iPadOS
  • Apple macOS

Classification

Weakness
  • CWE-79 Improper Neutralization of Input During Web Page Generation

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.