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), wdszzml, Atuin Automated Vulnerability Discovery Engine, Christian Kohlschütter, Sreejith Krishnan R, Dave G., @@pixiepointsec, Mickey Jin@@patch1t, Luke Roberts@@rookuu, Pedro Tôrres@@t0rr3sp3dr0, XiguaSec, DARKNAVY@@DarkNavyOrg, Ilya Andr (andrd3v)(RTU MIREA), Ilias Morad (A2nkF)(Voynich Group), Duy Trần@@khanhduytran0, @@hugeBlack, Himanshu Bharti@@Xpl0itme(Khatima), Guy Dor, Jex Amro, Tuan D. Hoang, Yongdae Kim @ KAIST SysSec Lab, Alvin Aries Tapia, Rosyna Keller(Totally Not Malicious Software), Adrián Pérez Martínez, Uluk Abylbekov, Zack Tickman, Ryan Dowd@@_rdowd, CVE-2025-55753, CVE-2025-58098, CVE-2025-59775, CVE-2025-65082, CVE-2025-66200, Koh M. Nakagawa@@tsunek0h(FFRI Security Inc), Talal Haj Bakry(Mysk Inc), Tommy Mysk@@mysk_co(Mysk Inc), Zhongquan Li@@Guluisacat, 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, 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, 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, Gyujeong Jin at Team.0xb6@@G1uN4sh

Affected Software

13 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 Safari<26.4
26.4
Apple iOS<18.7.7
18.7.7
Apple iPadOS<18.7.7
18.7.7
Apple macOS Tahoe<26.4
26.4
Apple iOS<26.4
26.4
Apple iPadOS<26.4
26.4
Apple visionOS<26.4
26.4
debian/webkit2gtk<=2.50.6-1~deb12u2, <=2.50.6-1~deb12u1
2.52.6-1~deb13u12.54.0-1~deb13u32.52.6-12.54.2-2
debian/wpewebkit<=2.38.6-1, <=2.48.3-1
2.54.2-1

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 debian/webkit2gtk to a version that resolves this vulnerability.

    Fixed in 2.52.6-1~deb13u1Fixed in 2.54.0-1~deb13u3Fixed in 2.52.6-1Fixed in 2.54.2-2
  4. Upgrade

    Upgrade debian/wpewebkit to a version that resolves this vulnerability.

    Fixed in 2.54.2-1
  5. Upgrade

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

    Fixed in 18.7.7
  6. Upgrade

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

    Fixed in 26.4
  7. Upgrade

    Upgrade macOS to a version that resolves this vulnerability.

    Fixed in 26.4
  8. Upgrade

    Upgrade Safari to a version that resolves this vulnerability.

    Fixed in 26.4
  9. Upgrade

    Upgrade visionOS to a version that resolves this vulnerability.

    Fixed in 26.4

Event History

Mar 17, 2026
Data Sourced
via Apple·12:00 AM
DescriptionWeaknessAffected Software
Exploit Published
via GitHub·08:32 PM
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
Mar 30, 2026
Data Sourced
via Red Hat·12:29 PM
DescriptionSeverityAffected 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

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