EUVD-2026-34526
GHSA-jh5p-649h-fjrv
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Primary rating from NVD.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N
Lifecycle Timeline
4DescriptionCVE.org
Inappropriate implementation in FileSystem in Google Chrome prior to 149.0.7827.53 allowed a remote attacker who had compromised the renderer process to bypass same origin policy via a crafted HTML page. (Chromium security severity: Medium)
AnalysisAI
Same-origin policy bypass in Google Chrome's FileSystem API implementation affects all desktop versions prior to 149.0.7827.53, exploitable by a remote attacker who has already achieved renderer process compromise. Delivering a crafted HTML page to a victim who interacts with it triggers the flaw, resulting in high-integrity cross-origin impact with no confidentiality or availability consequence. No public exploit code exists and EPSS sits at 0.02% (6th percentile), but the integrity impact and its role as a renderer-escape pivot make it relevant to multi-stage exploitation chains.
Technical ContextAI
The vulnerability resides in Chrome's FileSystem API subsystem - specifically the browser-side handling of filesystem operations initiated from renderer processes. CWE-20 (Improper Input Validation) identifies the root cause as insufficient validation of inputs crossing the renderer-to-browser process boundary, allowing a compromised renderer to issue FileSystem requests that the browser process honors without proper origin enforcement. The same-origin policy (SOP) is a core browser security boundary; bypassing it via FileSystem allows cross-origin data writes that would normally be prohibited. The affected CPE is Google Chrome desktop prior to build 149.0.7827.53 on Windows, macOS, and Linux, as confirmed by the EUVD affected version range 'Chrome 149.0.7827.53 < 149.0.7827.53'.
RemediationAI
The primary fix is to update Google Chrome to version 149.0.7827.53 or later via the stable channel, as documented in the vendor advisory at https://chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop.html. Most enterprise deployments should verify that automatic updates are enabled or push the update via policy (Google Admin Console or GPO). As an interim compensating control in environments that cannot patch immediately, blocking or restricting access to File System Access API features via enterprise policy (disabling the FileSystemAccessAPI policy flag) would reduce exposure, at the trade-off of breaking web applications that rely on local file access. Given that exploitation requires a prior renderer compromise, enforcing Chrome's site isolation mode (--site-per-process, enabled by default in modern Chrome) provides defense-in-depth by limiting the blast radius of any renderer compromise, though it does not directly address this specific flaw.
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Same weakness CWE-20 – Improper Input Validation
View allSame technique Authentication Bypass
View allVendor StatusVendor
SUSE
Severity: Medium| Product | Status |
|---|---|
| openSUSE Tumbleweed | Fixed |
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External POC / Exploit Code
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