EUVD-2026-65943
GHSA-4qf2-fgm5-c6v8
Severity by source
AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
S:C assigned because site isolation bypass inherently crosses distinct origin security authorities; AC:H reflects the renderer-compromise prerequisite; C:L for limited cross-origin data exposure only.
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 and leveraged social engineering 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 - and further leverages social engineering - to circumvent Chrome's cross-origin security boundary via a crafted HTML page, resulting in limited confidentiality exposure. The flaw resides in the SiteIsolation authorization logic (CWE-863), meaning Chrome fails to correctly validate whether a renderer process is permitted to access data belonging to a different origin. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires two simultaneous, non-trivial prerequisites: (1) the attacker must have already achieved code execution within Chrome's renderer process through a separate, unrelated browser vulnerability - a major precondition not captured by AC:H alone - and (2) the victim must be socially engineered into interacting with a crafted HTML page, confirmed by the CVSS UI:R metric. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The vendor CVSS 3.1 score of 3.1 (Low) reflects both high attack complexity (AC:H) and required user interaction (UI:R), and is broadly consistent with the narrow exploitation conditions. … 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 - this is the vendor-confirmed patched release as detailed in the Chrome Stable Channel advisory 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
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