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CVE-2026-78955 Google CVE debrief

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-08-25T21:17:51.520Z and has not been modified since then. The vulnerability, CVE-2026-78955, involves an observable discrepancy in PerformanceAPIs in Google Chrome prior to version 152.0.7977.65. This issue allows a remote attacker to potentially obtain cross-origin data via a crafted HTML page. The CVSS score for this vulnerability is 6.5, and it is classified as Medium severity. Google Chrome users, administrators, and security teams should be aware of this vulnerability and take necessary actions to secure their installations. Limited information is available on exploitation or affected scope, and defenders should verify Chrome versions, review advisories, and monitor for suspicious activity related to cross-origin data exposure.

Vendor
Google
Product
Chrome
CVSS
MEDIUM 6.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-25
Original CVE updated
2026-08-31
Advisory published
2026-08-25
Advisory updated
2026-08-31

Who should care

Google Chrome users, administrators, and security teams responsible for managing and securing Chrome installations should be aware of this Medium severity vulnerability. They should review and apply updates, verify system configurations, and monitor for potential cross-origin data exposure. IT and security teams should prioritize patching and review compensating controls for exposed systems.

Technical summary

Observable discrepancy in PerformanceAPIs in Google Chrome prior to 152.0.7977.65 allowed a remote attacker to potentially obtain cross-origin data via a crafted HTML page. The vulnerability has a CVSS score of 6.5 and is classified as Medium severity.

Defensive priority

Medium severity vulnerability in Google Chrome, requiring immediate attention to prevent potential cross-origin data exposure.

Recommended defensive actions

  • Apply Google Chrome update to version 152.0.7977.65 or later
  • Inventory and verify Google Chrome versions on managed systems
  • Monitor for suspicious activity related to cross-origin data exposure

Evidence notes

Observable discrepancy in PerformanceAPIs in Google Chrome prior to 152.0.7977.65 allowed a remote attacker to potentially obtain cross-origin data via a crafted HTML page. Limited information available on exploitation or affected scope. Evidence is based on CVE Program and NVD records. Defenders should verify Chrome versions, review advisory, and monitor for suspicious activity.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-78955 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-78955

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

  • CVE-2026-78955 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-78955

    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.