CVE-2013-1336: Microsoft .NET Framework

Medium severity, CVSS 5.0. EPSS: 19.3% chance of exploitation in the next 30 days.

The Common Language Runtime (CLR) in Microsoft .NET Framework 2.0 SP2, 3.5, 3.5.1, 4, and 4.5 does not properly check signatures, which allows remote attackers to make undetected changes to signed XML documents via unspecified vectors that preserve signature validity, aka "XML Digital Signature Spoofing Vulnerability."

Affected products

• Microsoft .NET Framework: version 2.0 only; version 3.5 only; version 3.5.1 only; version 4.0 only; version 4.5 only

Published 2013-05-15. Last modified 2026-06-16.