EUVD-2026-34667
GHSA-f5rp-j8px-phpc
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Primary rating from NVD.
CVSS VectorNVD
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Lifecycle Timeline
4DescriptionCVE.org
Insufficient policy enforcement in ServiceWorker in Google Chrome prior to 149.0.7827.53 allowed a remote attacker to leak cross-origin data via a crafted HTML page. (Chromium security severity: Medium)
AnalysisAI
Cross-origin data leakage via ServiceWorker policy bypass in Google Chrome affects all desktop versions prior to 149.0.7827.53. Insufficient policy enforcement in Chrome's ServiceWorker API allows unauthenticated remote attackers to read sensitive cross-origin data from a victim's browser session by directing the victim to a crafted HTML page. EPSS exploitation probability is very low at 0.03% (11th percentile), no public exploit code has been identified, and no CISA KEV listing exists at time of analysis - making this a moderate confidentiality risk that warrants patching but is not an immediate emergency for most organizations.
Technical ContextAI
ServiceWorker is a W3C-specified browser API that functions as a client-side programmable network proxy, intercepting and handling fetch requests between web pages and the network. It operates independently of the main browser thread and has access to the Cache API and background sync. The root cause is CWE-693 (Protection Mechanism Failure), meaning Chrome's enforcement of the same-origin policy - a core browser security boundary preventing one origin from reading data belonging to another - is insufficiently applied within the ServiceWorker execution context. A crafted ServiceWorker script can exploit this gap to observe or extract responses from cross-origin resources that should be opaque. The affected product is Google Chrome for desktop, all versions prior to 149.0.7827.53, as confirmed by EUVD-2026-34667 and the Chrome stable channel advisory.
RemediationAI
The primary fix is upgrading Google Chrome to version 149.0.7827.53 or later, as released via the Chrome stable channel and documented at http://chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop.html. Chrome's auto-update mechanism will apply this for most end-users automatically; enterprise administrators managing Chrome via policy (e.g., Google Admin Console or WSUS equivalents) should verify fleet-wide version compliance using endpoint management tooling. No vendor-documented workarounds are available for this vulnerability. As a compensating control where immediate patching is infeasible, organizations could restrict access to untrusted or external web content via web filtering proxies, though this carries significant usability trade-offs. Disabling ServiceWorker APIs via enterprise policy (chrome://flags or ExtensionInstallBlocklist) is not a standard supported option and could break legitimate web applications.
Use-after-free vulnerability in the DisplayObject class in the ActionScript 3 (AS3) implementation in Adobe Flash Player
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Same weakness CWE-693 – Protection Mechanism Failure
View allSame technique Information Disclosure
View allVendor StatusVendor
SUSE
Severity: Medium| Product | Status |
|---|---|
| openSUSE Tumbleweed | Fixed |
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External POC / Exploit Code
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