EUVD-2026-34769
GHSA-hg9f-77c4-x7m4
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Primary rating from NVD.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:L
Lifecycle Timeline
4DescriptionCVE.org
Inappropriate implementation in Extensions in Google Chrome prior to 149.0.7827.53 allowed an attacker who convinced a user to install a malicious extension to perform privilege escalation via a crafted Chrome Extension. (Chromium security severity: Low)
AnalysisAI
Privilege escalation in Google Chrome's Extensions subsystem, affecting all versions prior to 149.0.7827.53, allows a remote attacker who socially engineers a user into installing a crafted malicious extension to gain elevated privileges within the browser context, impacting confidentiality, integrity, and availability at a low-to-moderate level. The CVSS score of 6.3 (Medium) reflects the network-reachable attack vector offset by mandatory user interaction (UI:R), and Chromium's own security team rated this as Low severity - a notable downgrade from the NVD-calculated score. No public exploit code and no KEV listing have been identified at time of analysis, and the EPSS score of 0.01% (1st percentile) corroborates minimal observed exploitation activity.
Technical ContextAI
The vulnerability is rooted in CWE-269 (Improper Privilege Management) within Chrome's Extensions subsystem. Chrome extensions operate under a layered permission model enforced by the browser's sandboxing architecture; an 'inappropriate implementation' here indicates that the privilege boundary enforcement logic contains a flaw that a specially crafted extension manifest or runtime behavior can subvert. The affected component is the Chrome Extensions framework across all desktop platforms running Chrome prior to version 149.0.7827.53, as indicated by ENISA EUVD-2026-34769 and the Chromium security release. The CVSS scope is Unchanged (S:U), meaning exploitation is contained within the browser's security domain and does not directly escape to the underlying OS - though elevated extension privileges could still access sensitive user data, browser-stored credentials, or intercept web traffic depending on the privileges obtained.
RemediationAI
Update Google Chrome to version 149.0.7827.53 or later immediately, as this is the vendor-confirmed patched release per the official Chrome Stable Channel Update advisory at chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop.html. Chrome typically auto-updates, but administrators should verify the rollout has completed across managed endpoints by checking chrome://settings/help. For enterprise environments managing Chrome via policy (e.g., Google Admin Console or GPO), confirm the managed update has deployed to version 149.0.7827.53 or higher. As a compensating control prior to patching, administrators can restrict extension installation via Chrome Enterprise policy (ExtensionInstallBlocklist, ExtensionInstallAllowlist, or ExtensionInstallForcelist) to permit only vetted, IT-approved extensions - this directly addresses the attack prerequisite of user-installed malicious extensions. Note that overly broad extension restrictions may impact productivity workflows dependent on browser extensions; review installed extensions before applying blocklists.
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Same weakness CWE-269 – Improper Privilege Management
View allSame technique Privilege Escalation
View allVendor StatusVendor
SUSE
Severity: Medium| Product | Status |
|---|---|
| openSUSE Tumbleweed | Fixed |
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External POC / Exploit Code
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