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Google Chrome CVE-2026-87550

| EUVDEUVD-2026-74396 MEDIUM
Improper Encoding or Escaping of Output (CWE-116)
2026-09-09 Chrome GHSA-mjjr-x3qf-v4rg
4.3
CVSS 3.1 · Vendor: Chrome
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Severity by source

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

Network delivery via crafted page, no auth required, user must visit page (UI:R); only partial confidentiality impact, unchanged scope, no integrity or availability effect.

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

Primary rating from Vendor (Chrome).

CVSS VectorVendor: Chrome

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

Lifecycle Timeline

5
Metadata Corrected
Sep 09, 2026 - 18:40 vuln.today
tag: Authentication Bypass removed
Analysis Generated
Sep 09, 2026 - 18:27 vuln.today
Patch available
Sep 09, 2026 - 01:03 EUVD
CVE Published
Sep 09, 2026 - 00:09 cve.org
MEDIUM 4.3
CVE Published
Sep 09, 2026 - 00:09 cve.org
UNKNOWN (no severity yet)

DescriptionCVE.org

Improper encoding or escaping of output in CSS in Google Chrome prior to 153.0.8010.36 allowed a remote attacker to potentially bypass web origin policy via a crafted HTML page. (Chromium security severity: Medium)

AnalysisAI

CSS output encoding failure in Google Chrome prior to 153.0.8010.36 allows an unauthenticated remote attacker to potentially bypass the same-origin policy by luring a user to a crafted HTML page, resulting in limited cross-origin information disclosure. The CVSS score of 4.3 aligns with Chromium's own 'Medium' severity classification, reflecting that the impact is scoped to partial confidentiality loss with no integrity or availability consequence. …

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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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Impact
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Vulnerability AssessmentAI

Exploitation The victim must actively visit a crafted HTML page in an unpatched Chrome browser (UI:R); no action beyond page load is required once the user navigates to the attacker-controlled URL. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS vector AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N reflects a moderate-severity finding: network-reachable, trivial to attempt, no authentication required, but gated on a user visiting a malicious page and producing only partial confidentiality impact within an unchanged scope. … 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 Update Google Chrome to version 153.0.8010.36 or later, available via Chrome's built-in auto-update mechanism or manually through the stable channel release at https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html. … Detailed patch versions, workarounds, and compensating controls in full report.

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CVE-2026-87550 vulnerability details – vuln.today

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