Microsoft .NET Framework 2.0 SP2, 3.0 SP2, 3.5, 3.5.1, 4.5.2, 4.6, and 4.6.1 mishandles signature validation for unspecified elements of XML documents, which allows remote attackers to spoof signatures via a modified document, aka ".NET XML Validation Security Feature Bypass."
Severity
CVSS 3.0
9.8 critical
CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS
21% chance of exploitation in the next 30 days; higher than 97% of CVEs (scores of 2026-10-31)