CVE-2026-78966

MEDIUM
Published Aug 25, 2026 Modified Aug 28, 2026 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)

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CVSS v3.1 Score

4.3
MEDIUM
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:N

EPSS — Exploit Prediction

0.0046
Probability of exploitation
0.39%
Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-610 CWE-610

Affected Products

Vendor Product
google chrome

References

Frequently Asked Questions

What is CVE-2026-78966? +
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) It has a CVSS v3.1 base score of 4.3 (MEDIUM).
How severe is CVE-2026-78966? +
CVE-2026-78966 has a CVSS v3.1 score of 4.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance. The EPSS score is 0.0046, placing it in the 0th percentile for exploitation probability.
What products are affected by CVE-2026-78966? +
CVE-2026-78966 affects products from google, specifically: chrome. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2026-78966? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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