EUVD-2026-74347
GHSA-8wmj-mhqj-ch5c
Severity by source
AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H
Renderer pre-compromise and social engineering justify AC:H and UI:R; full host OS code execution post-sandbox-escape justifies S:C with C:H/I:H/A:H.
Primary rating from Vendor (Chrome).
CVSS VectorVendor: Chrome
Lifecycle Timeline
4DescriptionCVE.org
Insufficient policy enforcement in Extensions in Google Chrome prior to 153.0.8010.36 allowed a remote attacker who had compromised the renderer process and leveraged social engineering to potentially execute arbitrary code outside the sandbox via a crafted HTML page. (Chromium security severity: Medium)
AnalysisAI
Chrome's Extensions subsystem prior to 153.0.8010.36 fails to correctly enforce security policies when inputs originate from a compromised renderer process (CWE-807), enabling a two-stage sandbox escape that results in arbitrary code execution outside the Chrome sandbox on the host OS. Exploitation chains a prior renderer compromise with social engineering to bypass Extensions-mediated policy decisions. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires two compounding prerequisites that must both be satisfied: (1) the attacker must have already achieved renderer process compromise via a separate, independent vulnerability - CVE-2026-87479 is a second-stage sandbox-escape component and cannot be triggered in isolation against an uncompromised renderer; and (2) the attack requires active user interaction through social engineering, meaning the target must be induced to take a specific action (e.g., interacting with a crafted page element or extension prompt) that triggers the flawed policy decision. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 8.3 vector (AV:N/AC:H/PR:N/UI:R/S:C/C:H/I:H/A:H) correctly reflects a scope-changed, full-impact vulnerability requiring high attack complexity - AC:H captures the compounded prerequisites of renderer compromise and social engineering. … 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, as confirmed by the vendor advisory at https://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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Within 24 hours, inventory Chrome versions across your organization using Active Directory, MDM, or asset management tools to determine exposure scope and identify critical systems. …
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