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Description

Incorrect implementation of authentication algorithm in ASP.NET Core allows an authorized attacker to elevate privileges over a network.

PUBLISHED Reserved 2026-05-18 | Published 2026-07-14 | Updated 2026-07-14 | Assigner microsoft




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

Problem types

CWE-303: Incorrect Implementation of Authentication Algorithm

Product status

10.0.0 (custom) before 10.0.6
affected

8.0.0 (custom) before 8.0.29
affected

9.0.0 (custom) before 9.0.18
affected

17.12.0 (custom) before 17.12.22
affected

17.14.0 (custom) before 17.14.36
affected

18.0 (custom) before 18.7.4
affected

References

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-47300 (ASP.NET Core Elevation of Privilege Vulnerability) vendor-advisory patch

cve.org (CVE-2026-47300)

nvd.nist.gov (CVE-2026-47300)

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