EUVD-2026-65929
GHSA-3hxc-3qp2-294g
Severity by source
AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
Site isolation bypass crosses an origin security boundary warranting S:C; AC:H reflects mandatory prior renderer compromise; PR:N and UI:R match network delivery via crafted page.
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 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 cross origin security boundaries via a crafted HTML page, resulting in limited cross-site data disclosure. The flaw is an incorrect authorization check (CWE-863) in Chrome's SiteIsolation subsystem - a defense-in-depth mechanism that keeps different origins in separate OS processes. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires two explicit preconditions: (1) the attacker must have already achieved code execution within the Chrome renderer process via a separate, unrelated vulnerability - this is stated directly in the CVE description and captured by CVSS AC:H; and (2) the victim must interact with a crafted HTML page (CVSS UI:R). … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 score of 3.1 (Low) accurately reflects the high exploitation bar: AC:H captures the mandatory prerequisite of prior renderer compromise, UI:R requires victim interaction with a crafted page, and C:L constrains impact to limited cross-site data leakage with no integrity or availability consequence. … 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 | Vendor-released patch: Chrome 152.0.7977.65. … 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
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