CVE-2026-40379 PUBLISHED

Microsoft Enterprise Security Token Service (ESTS) Spoofing Vulnerability

Assigner: microsoft
Reserved: 11.04.2026 Published: 12.05.2026 Updated: 12.05.2026

Exposure of sensitive information to an unauthorized actor in Azure Entra ID allows an unauthorized attacker to perform spoofing over a network.

Metrics

CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N/E:U/RL:O/RC:C
CVSS Score: 9.3

Product Status

Vendor Microsoft
Product Microsoft Enterprise Security Token Service (ESTS)
Versions
  • Version - is affected

References

Problem Types