EUVD-2026-74309
GHSA-3jp9-5jfr-h82p
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N
Renderer pre-compromise raises AC to H; site isolation bypass inherently crosses origins warranting S:C; no availability impact described.
Primary rating from Vendor (Chrome).
CVSS VectorVendor: Chrome
Lifecycle Timeline
6DescriptionCVE.org
Missing authorization in SiteIsolation in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process to bypass site isolation via a crafted HTML page. (Chromium security severity: Medium)
Articles & Coverage 1
AnalysisAI
Site isolation authorization bypass in Google Chrome prior to 153.0.8010.36 allows a remote attacker who has already compromised the renderer process to escape cross-origin boundaries via a crafted HTML page. The flaw (CWE-862, Missing Authorization) resides in the SiteIsolation component, which enforces process-level separation between web origins; with that enforcement missing, a controlled renderer can access data belonging to other sites. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires the attacker to have already achieved code execution within the Chrome renderer process - a significant prerequisite typically fulfilled only by chaining a separate, distinct renderer exploitation vulnerability. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.1 vector (AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:N) rates confidentiality and integrity impact as High, yet the renderer pre-compromise prerequisite dramatically narrows exploitability - this vulnerability is meaningless without a separate renderer exploitation primitive already in hand, and Chromium's own 'Medium' internal severity rating captures that constraint more faithfully than the base CVSS score. … 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 | Upgrade Google Chrome to version 153.0.8010.36 or later via Chrome's built-in updater (chrome://settings/help) or through the stable channel release documented at chromereleases.googleblog.com/2026/09/stable-channel-update-for-desktop_0808145027.html. … Detailed patch versions, workarounds, and compensating controls in full report. |
Recommended ActionAI
Within 24 hours, audit Chrome deployment across your environment and identify endpoints still running versions prior to 153.0.8010.36. …
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Same weakness CWE-862 – Missing Authorization
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External POC / Exploit Code
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