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CVE-2026-17773 Google CVE debrief

CVE-2026-17773 is a Medium-severity vulnerability in Google Chrome prior to version 151.0.7922.72, allowing remote attackers to leak cross-origin data via a crafted HTML page. The vulnerability was published on 2026-07-30T01:16:40.557Z and last modified on 2026-10-23T23:10:00.157Z. This issue affects Chrome deployments, and defenders should assess exposure and prioritize patching to prevent potential data leaks. The vulnerability is caused by insufficient validation of untrusted input in Cast.

Vendor
Google
Product
Chrome
CVSS
MEDIUM 4.3
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-30
Original CVE updated
2026-10-23
Advisory published
2026-07-30
Advisory updated
2026-10-23

Who should care

Defenders responsible for Chrome deployments should assess exposure and prioritize patching to prevent potential data leaks. This includes verifying Chrome versions and applying patches. The vulnerability affects Chrome deployments and allows remote attackers to leak cross-origin data via a crafted HTML page.

Why it matters

CVE-2026-17773 is a Medium-severity vulnerability in Google Chrome that allows remote attackers to leak cross-origin data. Defenders should prioritize verifying Chrome versions and applying patches to prevent potential data leaks.

  • Potential data leaks due to insufficient input validation
  • Need to verify Chrome versions and apply patches
  • Possible exploitation via crafted HTML pages

Technical summary

Insufficient validation of untrusted input in Cast in Google Chrome prior to 151.0.7922.72 allowed a remote attacker to leak cross-origin data via a crafted HTML page. The vulnerability affects Chrome deployments and defenders should assess exposure and prioritize patching to prevent potential data leaks. The issue is caused by insufficient validation of untrusted input in Cast.

Defensive priority

Defenders should prioritize verifying Chrome versions and applying patches to prevent potential data leaks.

Recommended defensive actions

  • Verify Chrome version and apply patches
  • Monitor for potential data leaks
  • Review and update incident response plans

Evidence notes

The CVE record and NVD entry provide details on the vulnerability, including its Medium severity and the affected Chrome versions. The CVE record was published on 2026-07-30T01:16:40.557Z and has not been modified since then. Defenders should verify Chrome versions and apply patches to prevent potential data leaks. The vulnerability allows remote attackers to leak cross-origin data via a crafted HTML page.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-17773 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-17773

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

  • CVE-2026-17773 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-17773

    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.