EUVD-2026-74393
GHSA-x35f-9fpp-c2h4
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
AC:H because renderer pre-compromise is a hard prerequisite; S:C because SiteIsolation bypass crosses the origin-isolation security boundary by design.
Primary rating from Vendor (Chrome).
CVSS VectorVendor: Chrome
Lifecycle Timeline
6DescriptionCVE.org
Incorrect authorization in SiteIsolation in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to bypass system access restrictions via a crafted HTML page. (Chromium security severity: Medium)
AnalysisAI
SiteIsolation incorrect authorization in Google Chrome prior to 153.0.8010.36 allows a remote attacker who has already compromised the renderer process to bypass cross-origin access restrictions via a crafted HTML page. The flaw (CWE-863) carries a CVSS 6.5 with high integrity impact and no confidentiality or availability dimension, consistent with a second-stage sandbox-escape component rather than a standalone entry point. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires two chained conditions: (1) the attacker must have already achieved code execution inside the Chrome renderer process via a separate, unrelated vulnerability - this is the mandatory prerequisite and the primary limiting factor; (2) the victim user must navigate to or be redirected to a crafted HTML page (UI:R), meaning drive-by exploitation without any click-through is not sufficient. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The provided CVSS 6.5 (AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N) requires careful interpretation. … 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 153.0.8010.36 or later; this is the vendor-released patch for CVE-2026-87589 per the Chrome Releases stable-channel advisory at http://chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-863 – Incorrect Authorization
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External POC / Exploit Code
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