Why Microsoft issues emergency update for macOS and Linux ASP.NET threat

By

It can be exploited to allow unauthenticated attackers to forge authentication payloads during the HMAC validation process, which is used to verify the integrity and authenticity of data exchanged between a client and a server. Microsoft released an emergency patch for its ASP.NET Core to fix a high-severity vulnerability that allows unauthenticated attackers to gain SYSTEM privileges on devices that use the Web development framework to run Linux or macOS apps. The software maker said Tuesday evening that the vulnerability, tracked as CVE-2026-40372, affects versions 10.0.0 through 10.0.6 of the Microsoft.AspNetCore.DataProtection NuGet, a package that’s part of the framework. The critical flaw stems from a faulty verification of cryptographic signatures.

Beware: Forged credentials survive patching

During the time users ran a vulnerable version of the package, they were left open to an attack that would allow unauthenticated people to gain sensitive SYSTEM privileges that would allow full compromise of the underlying machine. Even after the vulnerability is patched, devices may still be compromised if authentication credentials created by a threat actor aren’t purged.Read full article Comments

microsoft issues emergency
Image via Flickr
Why Microsoft issues emergency update for macOS and Linux ASP.NET threat
Source: feeds.arstechnica.com

Related Articles

Recommended

Discover More

Rust 1.95.0 Rolls Out with Compile-Time Configuration Macro and Enhanced Pattern MatchingGit Documentation Gets Major Overhaul: New 'Data Model' Document Clarifies Core ConceptsPinpointing the Culprit: How Researchers Are Automating Failure Attribution in Multi-Agent LLM SystemsMastering AI-Assisted Coding: A Step-by-Step Guide to Agentic EngineeringMastering Long-Horizon Reinforcement Learning: A Step-by-Step Guide to a Divide-and-Conquer Approach