EUVD-2026-65926
GHSA-546h-c4p3-6wg8
Severity by source
AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
S:C better reflects crossing the Site Isolation security boundary into a privileged page managed by a different security authority; all other metrics align with vendor scoring.
Primary rating from Vendor (Chrome).
CVSS VectorVendor: Chrome
Lifecycle Timeline
4DescriptionCVE.org
Incorrect 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 into a privileged page via a crafted HTML page. (Chromium security severity: Medium)
AnalysisAI
Site Isolation bypass in Google Chrome prior to 152.0.7977.65 allows a remote attacker who has already compromised the renderer process to escape Chrome's cross-origin boundary enforcement and access a privileged page via a crafted HTML page. This is a chaining vulnerability rather than a standalone exploit - it requires a pre-existing renderer compromise (typically from a separate, higher-severity CVE) before the SiteIsolation authorization flaw can be leveraged. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Two distinct prerequisites must both be satisfied for exploitation: (1) the attacker must have already achieved code execution within a Chrome renderer process, typically through a separate higher-severity vulnerability such as a V8 memory corruption bug, and (2) the victim user must visit or interact with a crafted HTML page that triggers the SiteIsolation authorization check failure. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 3.1 (Low) with vector AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N accurately reflects the constrained standalone impact: AC:H captures the hard prerequisite of a pre-existing renderer compromise, UI:R confirms victim interaction is required, and C:L indicates only limited cross-origin data exposure. … 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 | The vendor-released patch is Chrome 152.0.7977.65, delivered via the stable channel update documented at 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-863 – Incorrect Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today