CVE-2026-28871

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.

Published: 2026-03-25 Last update: 2026-03-30 Assigner: [email protected] Source: [email protected]
NVD Status：Analyzed，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2026-28871 is rated Low Risk (18.7/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.02%). Low composite risk—no urgent action required; patch on your normal maintenance cycle and revisit priority if CVSS or EPSS increases.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2026-28871

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-03-25 — 0.02% —

Full EPSS history (1 record total)

Common vulnerability scoring system (CVSS) metrics for CVE-2026-28871

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
4.3 3.1 MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:N)
No account or special rights needed—anonymous or random user is enough.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:L)
Some sensitive info could get out, but not a total data dump.
Integrity (I:N)
Data isn’t meaningfully altered or forged.
Availability (A:N)
Service keeps running; no real outage angle.
 2.8 1.4 134c704f-9b21-4f2e-91b3-4a467353bcc0

Weakness enumeration for CVE-2026-28871

OS Trackers for CVE-2026-28871

vendor priority summary link
debian end-of-life CVE-2026-28871 end-of-life priority: Debian including 2 source packages (webkit2gtk, wpewebkit), 10 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): open 5, resolved 5. https://security-tracker.debian.org/tracker/CVE-2026-28871
redhat medium — https://access.redhat.com/security/cve/CVE-2026-28871
suse medium — https://www.suse.com/security/cve/CVE-2026-28871/
ubuntu medium CVE-2026-28871 medium priority: Ubuntu including 5 source packages (qtwebkit-opensource-src, qtwebkit-source, webkit2gtk, webkitgtk, wpewebkit), 31 status rows across 7 suites (bionic, focal, jammy, noble, questing, upstream, xenial): ignored 14, DNE 9, needs-triage 4, needed 3, released 1. https://ubuntu.com/security/CVE-2026-28871

Affected software / configurations for CVE-2026-28871

Vendor Product Version Raw CPE
apple safari < 26.4 cpe:2.3:a:apple:safari:*:*:*:*:*:*:*:*
apple ipados < 18.7.7 cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*
apple ipados >= 26.0, < 26.4 cpe:2.3:o:apple:ipados:*:*:*:*:*:*:*:*
apple iphone_os < 18.7.7 cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
apple iphone_os >= 26.0, < 26.4 cpe:2.3:o:apple:iphone_os:*:*:*:*:*:*:*:*
apple macos < 26.4 cpe:2.3:o:apple:macos:*:*:*:*:*:*:*:*

References for CVE-2026-28871

URL Tags
https://support.apple.com/en-us/126792 Release Notes Vendor Advisory
https://support.apple.com/en-us/126793 Release Notes Vendor Advisory
https://support.apple.com/en-us/126794 Release Notes Vendor Advisory
https://support.apple.com/en-us/126800 Release Notes Vendor Advisory
cvelogic Threat Intelligence