EUVD-2026-34720
GHSA-h83c-wr7v-rr3x
Severity by source
AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N
Primary rating from Vendor (google).
CVSS VectorVendor: google
Lifecycle Timeline
4DescriptionCVE.org
Insufficient validation of untrusted input in Cast in Google Chrome prior to 149.0.7827.53 allowed a remote attacker to bypass same origin policy via a crafted HTML page. (Chromium security severity: Low)
AnalysisAI
Same-origin policy bypass in Google Chrome's Cast component exposes users to limited cross-origin integrity violations via a crafted HTML page, affecting all desktop Chrome versions prior to 149.0.7827.53. An unauthenticated remote attacker can circumvent the browser's fundamental cross-origin boundary by exploiting insufficient input validation in the Cast subsystem, achieving a low-severity integrity impact against a visiting user. No public exploit has been identified at time of analysis, and the EPSS score of 0.02% (6th percentile) combined with Chromium's own 'Low' severity rating indicate minimal real-world exploitation risk.
Technical ContextAI
The Cast component in Google Chrome provides screen, tab, and media casting functionality to Chromecast-enabled devices and is present by default in standard Chrome installations. CWE-20 (Improper Input Validation) identifies the root cause as a failure to adequately sanitize or validate attacker-controlled input flowing through the Cast subsystem. This insufficient validation creates a pathway to circumvent the same-origin policy (SOP) - the browser security boundary that prevents scripts loaded from one origin from reading or writing data belonging to another origin. The CVSS vector CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:L/A:N reflects a network-accessible attack with low complexity requiring no privileges but mandating user interaction, with impact scoped entirely to a limited integrity violation and no confidentiality or availability consequence. No CPE strings were included in the provided intelligence data, but the EUVD identifier EUVD-2026-34720 confirms the version boundary as Chrome prior to 149.0.7827.53.
RemediationAI
The primary remediation is to upgrade Google Chrome to version 149.0.7827.53 or later, as confirmed by the vendor's stable channel update advisory at http://chromereleases.googleblog.com/2026/06/stable-channel-update-for-desktop.html. Chrome auto-update will deliver this fix to most end-user systems automatically; enterprise administrators should verify deployment via fleet management tools (e.g., checking chrome://version or enforcing minimum version policy). For organizations wishing to eliminate the Cast attack surface entirely while awaiting patch deployment, disabling the Cast feature via Chrome enterprise policy (CastEnabled=false) would remove the vulnerable component at the cost of losing all Chromecast and tab-casting functionality - a trade-off only appropriate for environments where casting is unused. No additional workarounds have been published by the vendor. NVD advisory is available at https://nvd.nist.gov/vuln/detail/CVE-2026-11259.
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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