EUVD-2026-74382
GHSA-c5xw-64wf-2427
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
AC:H captures the mandatory prior renderer compromise; S:C reflects cross-origin data access that inherently breaks isolation to other sites.
Primary rating from NVD.
CVSS VectorNVD
Lifecycle Timeline
6DescriptionNVD
Incorrect authorization in SiteIsolation in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process and leveraged social engineering to bypass site isolation via a crafted file. (Chromium security severity: Medium)
AnalysisAI
Site isolation bypass in Google Chrome prior to 153.0.8010.36 allows a remote attacker who has already compromised the renderer process to escape Chrome's cross-site isolation boundary via a crafted file combined with social engineering. The flaw is rooted in incorrect authorization (CWE-863) within the SiteIsolation component, meaning the browser fails to properly enforce origin-based access controls once the renderer is under attacker control. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Two sequential pre-conditions are required. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The formal CVSS 8.8 score (AV:N/AC:L/PR:N/UI:R) overstates realistic accessibility relative to Chromium's own 'Medium' rating, because the attack chain requires a pre-existing renderer compromise - itself a non-trivial prerequisite that most opportunistic attackers cannot satisfy on demand. … 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 via Chrome's built-in update mechanism (Help → About Google Chrome) or the stable channel update documented 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: Inventory all Chrome deployments and identify systems running versions prior to 153.0.8010.36. …
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Same weakness CWE-863 – Incorrect Authorization
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External POC / Exploit Code
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