CVE-2026-78955: Observable discrepancy in PerformanceAPIs

Published May 18, 2026
·
Updated

Chromium: CVE-2026-78955 Observable discrepancy in PerformanceAPIs

Other sources

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. (Chromium security severity: Medium)

— MITRE

This CVE was assigned by Chrome. Microsoft Edge (Chromium-based) ingests Chromium, which addresses this vulnerability. Please see Google Chrome Releases for more information.

— Microsoft

Credit

Google

Affected Software

5 affected componentsFixes available
Google Chrome<152.0.7977.65
Google Chrome<152.0.7977.64
152.0.7977.64
Microsoft Edge<152.0.4191.53
Microsoft Edge (Chromium-based)<152.0.4191.53
152.0.4191.53
Google Chrome<152.0.7977.65

Remediation

Recommended actions to resolve this vulnerability, in priority order.

  1. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 152.0.7977.64
  2. Upgrade

    Upgrade to a fixed release to a version that resolves this vulnerability.

    Fixed in 152.0.4191.53
  3. Upgrade

    Upgrade Google Chrome / Chromium (Edge inherits Chromium fixes) to a version that resolves this vulnerability.

    Fixed in 152.0.7977.65

Event History

May 18, 2026
CVE Published
12:00 AM
Data Sourced
12:00 AM
SeverityWeaknessAffected Software
Aug 25, 2026
CVE Published
via MITRE·08:10 PM
Data Sourced
via MITRE·08:10 PM
DescriptionWeakness
Data Sourced
via NVD·09:17 PM
DescriptionSeverityWeaknessAffected Software
Aug 28, 2026
Data Sourced
via Microsoft·02:00 PM
DescriptionSeverityWeaknessAffected Software
Updated
via Microsoft·02:00 PM
DescriptionAffected Software

Parent advisories

This vulnerability appears in the following advisories.

Peer vulnerabilities

Found alongside the following vulnerabilities.

Frequently Asked Questions

1

Who is exposed to this issue?

Users of Google Chrome versions earlier than 152.0.7977.65 are potentially exposed when they visit an attacker-controlled or crafted HTML page.

2

What does exploitation require?

The attacker must be able to cause the target to load a crafted HTML page remotely. The reported impact is potential access to cross-origin data through an observable discrepancy in PerformanceAPIs.

3

What version resolves the issue?

Google Chrome 152.0.7977.65 addresses this issue. Chrome versions prior to that release are affected according to the available information.

Company

Resources

Contact

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