CVE-2026-47303

HIGH
Published Jul 14, 2026 Modified Jul 15, 2026 CWE-90 CWE-302 CWE-863

Description

Authentication bypass by assumed-immutable data in ASP.NET Core allows an authorized attacker to elevate privileges over a network.

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CVSS v3.1 Score

8.8
HIGH
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS — Exploit Prediction

0.0074
Probability of exploitation
0.51%
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-90 CWE-90
CWE-302 CWE-302
CWE-863 Incorrect Authorization

References

Frequently Asked Questions

What is CVE-2026-47303? +
Authentication bypass by assumed-immutable data in ASP.NET Core allows an authorized attacker to elevate privileges over a network. It has a CVSS v3.1 base score of 8.8 (HIGH).
How severe is CVE-2026-47303? +
CVE-2026-47303 has a CVSS v3.1 score of 8.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching. The EPSS score is 0.0074, placing it in the 1th percentile for exploitation probability.
How do I check if I'm vulnerable to CVE-2026-47303? +
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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