EUVD-2026-65844
GHSA-758q-grfg-chrv
Severity by source
AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Sandbox escape crosses Chrome's security boundary warranting S:C over S:U; co-installed app prerequisite drives AV:L and AC:H with no system-level privileges required from the attacker.
Primary rating from Vendor (Chrome).
CVSS VectorVendor: Chrome
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Lifecycle Timeline
4DescriptionCVE.org
Missing authorization in CustomTabs in Google Chrome on on Android prior to 152.0.7977.65 allowed a local attacker to potentially execute arbitrary code outside the sandbox via a co-installed app. (Chromium security severity: Medium)
AnalysisAI
CustomTabs in Google Chrome for Android prior to version 152.0.7977.65 exposes a missing authorization flaw (CWE-862) that allows a local attacker, operating through a co-installed malicious application, to potentially escape the Chrome sandbox and execute arbitrary code. The Chromium security team rated this Medium severity internally, and the EPSS score of 0.13% at the 3rd percentile confirms no observed exploitation activity. …
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Attack ChainAIDerived
Hypothetical attack flow derived from CVE metadata
Vulnerability AssessmentAI
| Exploitation | Exploitation requires that the target Android device has both a vulnerable version of Google Chrome (prior to 152.0.7977.65) and a malicious attacker-controlled application co-installed on the same device. … Additional conditions and limiting factors are described in the full assessment. |
| Risk Assessment | The CVSS 3.1 base score of 7.4 with vector AV:L/AC:H/PR:N/UI:N/S:U reflects a local attack requiring high complexity due to the co-installed app prerequisite, with full confidentiality, integrity, and availability impact assessed. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in. |
| Exploit Scenario | An attacker distributes a malicious Android application - potentially disguised as a utility or productivity tool - which, once co-installed on the victim's device alongside a vulnerable Chrome version, exploits the missing authorization check in the CustomTabs interface to escape Chrome's sandbox and execute arbitrary code outside it. No public proof-of-concept has been identified at time of analysis, and the high attack complexity (AC:H) reflects that the attacker must successfully deliver and install the malicious app before triggering the specific authorization gap in CustomTabs. … |
| Remediation | The primary remediation is to update Google Chrome on Android to version 152.0.7977.65 or later, as confirmed by the Chrome 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. |
Recommended ActionAI
Within 24 hours, identify and alert users with Android devices running Chrome versions prior to 152.0.7977.65. …
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Same weakness CWE-862 – Missing Authorization
View allSame technique Authentication Bypass
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External POC / Exploit Code
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