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Google Chrome EUVDEUVD-2026-74437

| CVE-2026-87561 MEDIUM
Incorrect Authorization (CWE-863)
2026-09-09 Chrome GHSA-pwfx-cvw3-39gw
Authentication Bypass Google
4.3
CVSS 3.1 · NVD
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Severity by source

NVD PRIMARY
4.3 MEDIUM
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
vuln.today AI
4.3 MEDIUM

Network delivery via extension, user must install it (UI:R), no privileges needed; impact is integrity-only origin-policy bypass with no C/A component.

3.1 AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
4.0 AV:N/AC:L/AT:N/PR:N/UI:A/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
Low
Availability
None

Lifecycle Timeline

5
Analysis Generated
Sep 09, 2026 - 20:23 vuln.today
CVSS changed
Sep 09, 2026 - 20:22 NVD
4.3 (MEDIUM)
Patch available
Sep 09, 2026 - 01:03 EUVD
CVE Published
Sep 09, 2026 - 00:10 nvd
MEDIUM 4.3
CVE Published
Sep 09, 2026 - 00:10 cve.org
UNKNOWN (no severity yet)

DescriptionNVD

Incorrect authorization in Web Authentication in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to bypass web origin policy via a crafted Chrome extension. (Chromium security severity: Low)

AnalysisAI

Incorrect authorization in the Web Authentication (WebAuthn) API implementation of Google Chrome prior to 153.0.8010.36 allows a remote attacker to bypass the web origin policy via a crafted Chrome extension. The bypass permits unauthorized cross-origin interaction with WebAuthn credentials, resulting in limited integrity impact. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Persist
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Vulnerability AssessmentAI

Exploitation Exploitation requires the victim to install a specially crafted Chrome extension on their browser - this is not a passive drive-by attack. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment Real-world risk is low. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation Vendor-released patch: Chrome 153.0.8010.36. … Detailed patch versions, workarounds, and compensating controls in full report.
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Threat intelligence, references, and detailed analysis are available after sign-in.

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EUVD-2026-74437 vulnerability details – vuln.today
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