EUVD-2026-74324
GHSA-88mf-8g4h-9w7f
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
AC:H because prior renderer compromise is required; S:C because site isolation bypass crosses the security boundary between origins; no availability impact.
Primary rating from Vendor (Chrome).
CVSS VectorVendor: Chrome
Lifecycle Timeline
6DescriptionCVE.org
Incorrect authorization in ServiceWorker in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted HTML page. (Chromium security severity: Medium)
AnalysisAI
Site isolation bypass in Google Chrome's ServiceWorker implementation allows a remote attacker who has already compromised the renderer process to escape cross-origin protections via a crafted HTML page. All Chrome versions prior to 153.0.8010.36 are affected. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires two sequential conditions: (1) the attacker must have already achieved code execution inside a Chrome renderer process via a separate, chained vulnerability - this is a non-trivial prerequisite that limits exploitation to multi-stage attack chains; and (2) a user must be induced to visit a crafted HTML page (UI:R). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | Real-world risk is moderate despite the CVSS 8.1 score. … 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 | Upgrade Google Chrome to version 153.0.8010.36 or later via the stable channel update announced at https://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, enable Chrome auto-updates across your organization and verify version 153.0.8010.36 or later is available. …
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Same weakness CWE-863 – Incorrect Authorization
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External POC / Exploit Code
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