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CVE-2026-11284 Google CVE debrief

CVE-2026-11284 is a side-channel information leakage vulnerability in PerformanceAPIs in Google Chrome prior to version 149.0.7827.53. This vulnerability, with a CVSS score of 6.5 and a severity of MEDIUM, allowed a remote attacker to leak cross-origin data via a crafted HTML page.

Vendor
Google
Product
Chrome
CVSS
MEDIUM 6.5
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 prior to version 149.0.7827.53 should update to the latest version to mitigate this vulnerability.

Technical summary

The vulnerability is caused by a side-channel information leakage in PerformanceAPIs. This allows a remote attacker to leak cross-origin data via a crafted HTML page.

Defensive priority

The CVSS score of 6.5 and a severity of MEDIUM indicate that this vulnerability should be prioritized for remediation.

Recommended defensive actions

  • Update Google Chrome to version 149.0.7827.53 or later.

Evidence notes

The CVE was published on 2026-06-05T00:17:05.790Z and modified on 2026-06-09T15:27:37.597Z.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-11284 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-11284

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

  • CVE-2026-11284 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-11284

    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.