PatchSiren

PatchSiren cyber security CVE debrief

CVE-2026-11259 Google CVE debrief

CVE-2026-11259 is a vulnerability in Google Chrome prior to version 149.0.7827.53. The issue is related to insufficient validation of untrusted input in the Cast feature, which could allow a remote attacker to bypass the same-origin policy via a crafted HTML page. The vulnerability has a CVSS score of 4.3, indicating a medium severity level.

Vendor
Google
Product
Chrome
CVSS
MEDIUM 4.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-05
Original CVE updated
2026-07-23
Advisory published
2026-06-05
Advisory updated
2026-07-23

Who should care

Users of Google Chrome, particularly those who use the Cast feature, should be aware of this vulnerability and ensure they are running the latest version of Chrome (149.0.7827.53 or later).

Technical summary

The vulnerability is caused by insufficient validation of untrusted input in the Cast feature of Google Chrome. This could allow a remote attacker to bypass the same-origin policy via a crafted HTML page.

Defensive priority

Medium

Recommended defensive actions

  • Update Google Chrome to version 149.0.7827.53 or later.
  • Use a web browser other than Google Chrome until an update is available.

Evidence notes

The CVE record and NVD detail can be found at [cve-org] and [nvd], respectively.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-11259 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-11259

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-11259 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-11259

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.