What’s Vulnerable › Vulnerabilities

CVE-2026-78966

• Severity: medium (CVSS 4.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-25 · updated 2026-08-28
• Weakness: CWE-610

Description

Externally controlled reference in QUIC in Google Chrome prior to 152.0.7977.65 allowed a remote attacker to bypass web origin policy via a crafted HTML page. (Chromium security severity: Medium)

Affected products

• Google Chrome: before 152.0.7977.65 — fixed in 152.0.7977.65

How to fix

Upgrade to a fixed version: Google Chrome 152.0.7977.65. Check the vendor advisory for mitigations.

In the news

• Chromium: CVE-2026-78966 Externally controlled reference in QUIC

References

• https://chromereleases.googleblog.com/2026/08/stable-channel-update-for-desktop_0256176589.html
• https://issues.chromium.org/issues/497637694

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