EUVD-2026-66022
GHSA-2qxw-wfpc-x6cp
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Renderer process compromise prerequisite raises complexity to AC:H; PR:N and UI:R per description; C:L only with no integrity or availability impact.
Primary rating from Vendor (Chrome).
CVSS VectorVendor: Chrome
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N
Lifecycle Timeline
4DescriptionCVE.org
Missing authorization in Preload in Google Chrome prior to 152.0.7977.65 allowed a remote attacker who had compromised the renderer process to bypass web origin policy via a crafted HTML page. (Chromium security severity: Low)
AnalysisAI
Missing authorization in Chrome's Preload subsystem (CWE-862) allows an attacker who has already compromised the renderer process to bypass the web origin policy via a crafted HTML page, affecting all Chrome desktop versions prior to 152.0.7977.65. The bypass results in limited cross-origin data disclosure (confidentiality impact only). …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires two sequential conditions: (1) the attacker must have already achieved renderer process compromise through a separate vulnerability - this is not a default or trivially reached state; and (2) a user must visit a crafted HTML page (UI:R), providing the trigger for the Preload authorization bypass. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 4.3 with vector AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N nominally suggests a straightforward, low-complexity network attack requiring only user interaction, but this framing substantially overstates accessibility: the description explicitly conditions exploitation on a prior renderer process compromise, a non-trivial prerequisite that makes the real-world attack chain considerably more complex than AC:L implies. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker first compromises the Chrome renderer process through a separate, independent vulnerability, then serves the victim a crafted HTML page that triggers the missing authorization check in the Preload subsystem. The compromised renderer reads cross-origin data it should not be permitted to access, bypassing the Same-Origin Policy and potentially exposing session tokens or page content from other origins. … |
| Remediation | Update Google Chrome to version 152.0.7977.65 or later via the Chrome stable channel (https://chromereleases.googleblog.com/2026/08/stable-channel-update-for-desktop_0256176589.html); this is the vendor-confirmed fix. … Detailed patch versions, workarounds, and compensating controls in full report. |
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Same weakness CWE-862 – Missing Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
Leaving vuln.today