EUVD-2026-65959
GHSA-q5r9-8rpf-9h3p
Severity by source
AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N
AC:H reflects the mandatory prerequisite renderer compromise; C:L only as the bypass enables cross-origin data read, not system-level impact; no I or A consequences apply.
Primary rating from Vendor (Chrome).
CVSS VectorVendor: Chrome
Lifecycle Timeline
4DescriptionCVE.org
Incomplete cleanup 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 exploits incomplete cleanup (CWE-459) in the SiteIsolation component, enabling a remote attacker who has already compromised the renderer process to escape Chrome's cross-origin process separation via a crafted HTML page. This is a chained, second-stage attack - the CVSS score of 3.1 (Low) and EPSS of 0.28% (20th percentile) reflect the high prerequisite bar of a prior renderer compromise. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the attacker has already achieved compromise of the Chrome renderer process through a separate vulnerability before this flaw can be leveraged - it cannot be used as a standalone attack. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 3.1 (Low) is well-calibrated for this vulnerability: AC:H reflects the high bar of requiring a pre-existing renderer compromise; UI:R requires the victim to interact with attacker-controlled content; and impact is limited to C:L 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 | Update Google Chrome to version 152.0.7977.65 or later, as documented in the 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-459 – Incomplete Cleanup
View allSame technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today