CVE-2026-20643: Input Validation

Published Mar 17, 2026
·
Updated

802.1X. An authentication issue was addressed with improved state management.

Other sources

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.

— NVD

Accounts. An authorization issue was addressed with improved state management.

— Apple

Admin Framework. A path handling issue was addressed with improved validation.

— Apple

apache. This is a vulnerability in open source code and Apple Software is among the affected projects. The CVE-ID was assigned by a third party. Learn more about the issue and CVE-ID at cve.org.

— Apple

App Protection. The issue was addressed with improved checks.

— Apple

Credit

Thomas Espach, webb, @@hamayanhamayan, Yeonghyeon Choi, Daniel Rhea, Söhnke Benedikt Fischedick (Tripton), Emrovsky & Switch3301, Yevhen Pervushyn, Minse Kim, Narcis Oliveras Fontàs, Nathaniel Oh@@calysteon, Hongze Wu(Ant Group Infrastructure Security Team), Shuaike Dong(Ant Group Infrastructure Security Team), greenbynox, Arni Hardarson, an anonymous researcher, Gongyu Ma@@Mezone0, Justin Cohen(Google), Cristian Dinca (icmd.tech), Hossein Lotfi@@hosselot(TrendAI Zero Day Initiative), Etienne Charron (Renault), Victoria Martini (Renault), Zhongcheng Li(IES Red Team), CVE-2025-14524, Andreas Jaegersberger & Ro Achterberg(Nosebeard Labs), Kirin@@Pwnrin, CVE-2025-64505, iG0x72(XiguaSec), JJ(XiguaSec), Lehan Dilusha Jayasinghe, Gor Aleksanyan(BoB 0xB6), Dhiyanesh Selvaraj@@redroot97(BoB 0xB6), 이동하 (Lee Dong Ha(BoB 0xB6), Jian Lee@@speedyfriend433, Johnny Franks@@0xjohnny, Alex Radocea, Hazem Issa, Yongdae Kim @ SysSec, KAIST, Caspian Tarafdar, Andrew Becker, Mike Cardwell(grepular), Bob Lord, Johnny Franks (zeroxjf), Héloïse Gollier, Mathy Vanhoef (KU Leuven), Rosyna Keller(Totally Not Malicious Software), Ryan Dowd@@_rdowd, CVE-2025-55753, CVE-2025-58098, CVE-2025-59775, CVE-2025-65082, CVE-2025-66200, Mickey Jin@@patch1t, Koh M. Nakagawa@@tsunek0h(FFRI Security Inc), Talal Haj Bakry(Mysk Inc), Tommy Mysk@@mysk_co(Mysk Inc), Zhongquan Li@@Guluisacat, Jex Amro, YingQi Shi@@Mas0nShi(DBAppSecurity's WeBin lab), Mustafa Calap@@ordinal0, dbg.re), Asaf Cohen, 风沐云烟@@binary_fmyy, Minghao Lin@@Y1nKoc, Jonathan Bar Or@@yo_yo_yo_jbo, DARKNAVY@@DarkNavyOrg, XiguaSec, Ye Zhang(Baidu Security), Ryan Dowd@@_rdowd(Iru), Csaba Fitzl@@theevilbit(Iru), Joseph Ravichandran@@0xjprx(MIT CSAIL), hari shanmugam, Yuebin Sun@@yuebinsun2020(SecuRing), an anonymous researcher(SecuRing), Nathaniel Oh@@calysteon(SecuRing), Kirin@@Pwnrin(SecuRing), Wojciech Regula(SecuRing), Joshua Jewett@@JoshJewett33, Ilya Andr (andrd3v)(RTU MIREA), Ilias Morad (A2nkF)(Voynich Group), Duy Trần@@khanhduytran0, @@hugeBlack, Himanshu Bharti@@Xpl0itme(Khatima), Rodolphe Brunetti@@eisw0lf(Lupus Nova), Matej Moravec@@MacejkoMoravec, Dawuge(Shuffle Team), Hunan University, Gergely Kalman@@gergely_kalman, Andrei Dodu, Morris Richman@@morrisinlife, Kun Peeks@@SwayZGl1tZyyy, Dave G., Gyujeong Jin at Team.0xb6@@G1uN4sh, wdszzml, Atuin Automated Vulnerability Discovery Engine, Christian Kohlschütter, Sreejith Krishnan R, @@pixiepointsec, Luke Roberts@@rookuu, Pedro Tôrres@@t0rr3sp3dr0, Guy Dor, Tuan D. Hoang, Yongdae Kim @ KAIST SysSec Lab, Alvin Aries Tapia, Adrián Pérez Martínez, Uluk Abylbekov, Zack Tickman

Affected Software

11 affected componentsFixes available
Apple About Background Security Improvements
Apple iPadOS<26.3.1
Apple iPhone OS<26.3.1
Apple macOS<26.3.1
Apple iOS<18.7.7
18.7.7
Apple iPadOS<18.7.7
18.7.7
Apple iOS<26.4
26.4
Apple iPadOS<26.4
26.4
Apple macOS Tahoe<26.4
26.4
Apple visionOS<26.4
26.4
Apple Safari<26.4
26.4

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 26.4
  2. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 18.7.7
  3. Upgrade

    Upgrade iOS/iPadOS to a version that resolves this vulnerability.

    Fixed in 18.7.7
  4. Upgrade

    Upgrade iOS/iPadOS to a version that resolves this vulnerability.

    Fixed in 26.4
  5. Upgrade

    Upgrade macOS to a version that resolves this vulnerability.

    Fixed in 26.4
  6. Upgrade

    Upgrade Safari to a version that resolves this vulnerability.

    Fixed in 26.4
  7. Upgrade

    Upgrade visionOS to a version that resolves this vulnerability.

    Fixed in 26.4

Event History

Mar 17, 2026
Updated
via Apple·08:52 PM
DescriptionWeaknessAffected Software
CVE Published
via MITRE·10:29 PM
Data Sourced
via MITRE·10:29 PM
DescriptionWeakness
Data Sourced
via NVD·11:16 PM
DescriptionSeverityWeaknessAffected Software
Mar 18, 2026
News Published
via BleepingComputer·01:06 AM
News Published
via BleepingComputer·01:07 AM
Mar 24, 2026
Data Sourced
via Apple·12:00 AM
DescriptionWeaknessAffected Software
Updated
via Apple·12:00 AM
DescriptionWeakness
Updated
via Apple·12:00 AM
DescriptionWeaknessAffected Software
Updated
via Apple·12:00 AM
Affected Software
Mar 30, 2026
Data Sourced
via Red Hat·12:29 PM
DescriptionSeverityAffected Software
Aug 21, 2026
Updated
via Apple·08:05 PM
DescriptionWeaknessAffected Software
Updated
via Apple·08:05 PM
Affected Software
Updated
via Apple·08:05 PM
DescriptionWeaknessAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

What is the severity of CVE-2026-20643?

CVE-2026-20643 has been classified as a high severity vulnerability due to its potential to bypass the Same Origin Policy.

2

How do I fix CVE-2026-20643?

To fix CVE-2026-20643, ensure that your device is updated to Background Security Improvements for iOS 26.3.1, iPadOS 26.3.1, macOS 26.3.1, or macOS 26.3.2.

3

What is the impact of CVE-2026-20643?

The impact of CVE-2026-20643 allows maliciously crafted web content to potentially bypass security restrictions.

4

Which platforms are affected by CVE-2026-20643?

CVE-2026-20643 affects iOS, iPadOS, and macOS versions prior to the specified security updates.

5

What component is involved in CVE-2026-20643?

CVE-2026-20643 involves the Navigation API within the WebKit component.

Company

Resources

Contact

SecAlerts Pty Ltd.
132 Wickham Terrace
Fortitude Valley,
QLD 4006, Australia
info@secalerts.co
By using SecAlerts services, you agree to our services end-user license agreement. This website is safeguarded by reCAPTCHA and governed by the Google Privacy Policy and Terms of Service. All names, logos, and brands of products are owned by their respective owners, and any usage of these names, logos, and brands for identification purposes only does not imply endorsement. If you possess any content that requires removal, please get in touch with us.
© 2026 SecAlerts Pty Ltd.
ABN: 70 645 966 203, ACN: 645 966 203