EUVD-2026-65927
GHSA-qwmc-fc5p-qxxh
Severity by source
AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Site isolation is a cross-security-boundary control; bypassing it crosses into another origin's security domain, warranting S:C; renderer compromise prerequisite justifies AC:H.
Primary rating from Vendor (Chrome).
CVSS VectorVendor: Chrome
Lifecycle Timeline
4DescriptionCVE.org
Missing authorization in SiteIsolation in Google Chrome prior to 152.0.7977.65 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted PDF file. (Chromium security severity: Medium)
AnalysisAI
Site isolation boundary bypass in Google Chrome prior to 152.0.7977.65 enables an attacker who has already compromised the renderer process to read cross-origin data via a crafted PDF file. This is a chained, second-stage attack technique - not a standalone exploit - requiring renderer process compromise as a hard prerequisite before the missing authorization check (CWE-862) in SiteIsolation becomes actionable. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Two sequential conditions are required: first, the attacker must achieve code execution within a Chrome renderer process via a separate, unrelated vulnerability - this is the primary limiting factor and a substantial barrier; second, the victim must interact with or be served a crafted PDF file within the same Chrome session (UI:R). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The official CVSS 3.1 score of 3.1 (AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N) accurately reflects low real-world priority. … 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 152.0.7977.65 or later, as confirmed by the Google stable channel advisory (https://chromereleases.googleblog.com/2026/08/stable-channel-update-for-desktop_0256176589.html). … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-862 – Missing Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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