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Chrome CVE-2026-5903

| EUVDEUVD-2026-20727 MEDIUM
Protection Mechanism Failure (CWE-693)
2026-04-08 Chrome GHSA-c9xc-4327-hw8j
Authentication Bypass Google Red Hat Suse Chrome
6.5
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
6.5 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
SUSE
MEDIUM
qualitative
Red Hat
6.1 LOW
qualitative

Primary rating from NVD.

CVSS VectorNVD

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
None

Lifecycle Timeline

5
Analysis Generated
Apr 15, 2026 - 12:46 vuln.today
CVSS changed
Apr 13, 2026 - 19:37 NVD
6.5 (MEDIUM)
Patch released
Apr 08, 2026 - 23:32 nvd
Patch available
EUVD ID Assigned
Apr 08, 2026 - 22:01 euvd
EUVD-2026-20727
CVE Published
Apr 08, 2026 - 21:21 nvd
N/A

DescriptionCVE.org

Policy bypass in IFrameSandbox in Google Chrome prior to 147.0.7727.55 allowed a remote attacker who convinced a user to engage in specific UI gestures to bypass navigation restrictions via a crafted HTML page. (Chromium security severity: Low)

AnalysisAI

Bypass of iframe sandbox navigation restrictions in Google Chrome prior to version 147.0.7727.55 allows remote attackers to circumvent security boundaries via a crafted HTML page combined with specific user UI gestures. The vulnerability affects the IFrameSandbox security mechanism, which is designed to prevent iframes from navigating the top-level window; successful exploitation requires user interaction but results in direct integrity impact through unauthorized navigation. This is a low-severity issue with minimal exploitation probability (EPSS 0.02%, percentile 3%) and no confirmed active exploitation.

Technical ContextAI

The IFrameSandbox feature in Chromium implements sandbox restrictions on iframe elements to enforce the Same-Origin Policy and prevent malicious frames from accessing or manipulating the parent window's navigation. The vulnerability exists in the sandbox policy enforcement logic (CWE-693: Protection Mechanism Failure), where insufficient validation of navigation restrictions allows a crafted HTML page to bypass these controls. The attack leverages a gap in how Chrome validates iframe-to-parent navigation transitions when specific user gestures are involved, essentially defeating the intended isolation boundary that sandboxed iframes are meant to provide.

RemediationAI

Update Google Chrome to version 147.0.7727.55 or later immediately via the browser's built-in auto-update mechanism or manual download from https://chromereleases.googleblog.com/2026/04/stable-channel-update-for-desktop.html. The vendor-released patch directly addresses the sandbox navigation enforcement logic and is the only effective mitigation. Organizations using Chromium-based browsers should verify that auto-updates are enabled and confirm the installed version exceeds 147.0.7727.55 to ensure the sandbox policy bypass is resolved.

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Vendor StatusVendor

SUSE

Severity: Medium
Product Status
SUSE Package Hub 15 SP6 Fixed
openSUSE Leap 15.6 Fixed
openSUSE Tumbleweed Fixed
SUSE Package Hub 15 SP6 Fixed

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CVE-2026-5903 vulnerability details – vuln.today
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