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CVE detail

CVE-2026-40372

Improper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.

CVSS 9.1 · CriticalBuzz score 43.0

Buzz score

Why this CVE is surfacing

Buzz score total 43.0

This all-time snapshot uses the same composite formula as Trending across a 30-year evidence window, rather than a current rolling window.

Buzz score components · mention 23.0 · diversity 20.0 · KEV 0.0 · OTX 0.0 · PoC 0.0
Mention score
23.0
9 evidence mentions in the snapshot
Diversity score
20.0
8 sources across 4 categories
KEV score
0.0
No KEV entry observed
OTX score
0.0
0 OTX pulses
PoC score
0.0
0 repos · best confidence N/A
Best PoC traction
0
Maximum stars on a matched PoC repo

Why it matters now

Mention timeline

Total mentions
0
within the 30d window
Peak daily
0
highest bucket

Evidence

Source links by recency

Newest mentions first
9 source links · newest first
  • May 2026 Patch Tuesday forecast: AI starts driving security industry changesHelp Net Security

    Microsoft May 2026 Patch Tuesday is now live: Many fixes, but no zero-days Project Glasswing. This is one of three major security industry changes I’ll cover today. The Anthropic Mythos vulnerability discovery model has already proven to be game changing in its ability to identify new vulnerabilities in software. Many of these vulnerabilities have existed for 10 to 15 years without human discovery. In a recent announcement from Mozilla, they discovered 271 vulnerabilities when running … More →

    newswww.helpnetsecurity.comMay 8, 2026, 6:19 AM
  • CVE-2026-40372 ASP.NET Core Elevation of Privilege VulnerabilityMicrosoft MSRC

    This CVE has been updated to include the Visual Studios 2026 18.5 as an Affected Software

    vendormsrc.microsoft.comApr 28, 2026, 2:00 PM
  • 27th April – Threat Intelligence ReportCheck Point Research

    For the latest discoveries in cyber research for the week of 27th April, please download our Threat Intelligence Bulletin. TOP ATTACKS AND BREACHES Vercel, a frontend cloud platform, has disclosed a security incident linked to a compromise at Context.ai, where stolen OAuth tokens enabled unauthorized access through a connected app. The company reported access to employee […]

    vendorresearch.checkpoint.comApr 27, 2026, 12:07 PM
  • Security Affairs newsletter Round 574 by Pierluigi Paganini – INTERNATIONAL EDITIONSecurity Affairs

    A new round of the weekly Security Affairs newsletter has arrived! Every week, the best security articles from Security Affairs are free in your email box. Enjoy a new round of the weekly SecurityAffairs newsletter, including the international press. U.S. CISA adds SimpleHelp, Samsung, and D-Link flaws to its Known Exploited Vulnerabilities catalog Over 400,000 […]

    newssecurityaffairs.comApr 26, 2026, 8:41 AM
  • Microsoft issues out-of-band patch for critical security flaw in update to ASP.NET CoreCSO Online

    Developers are advised to check their applications after Microsoft revealed that last week’s ASP.NET Core update inadvertently introduced a serious security flaw into the web framework’s Data Protection Library. Microsoft describes the issue as a “regression,” coding jargon for an update that breaks something that was previously working correctly. In this case, what was introduced […]

    newswww.csoonline.comApr 22, 2026, 6:37 PM
  • Microsoft out-of-band updates fixed critical ASP.NET Core privilege escalation flawSecurity Affairs

    Microsoft fixed critical ASP.NET Core vulnerability, tracked as CVE-2026-40372 (CVSS score of 9.1), that lets attackers escalate privileges. Microsoft released out-of-band updates to address a serious ASP.NET Core vulnerability tracked as CVE-2026-40372 (CVSS score of 9.1). Microsoft fixed the flaw in ASP.NET Core version 10.0.7. An attacker could exploit the flaw to gain SYSTEM-level privileges, access […]

    newssecurityaffairs.comApr 22, 2026, 2:00 PM
  • https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-40372.jsonsecurity.access.redhat.com

    No excerpt available.

    Vendor Advisorysecurity.access.redhat.comApr 21, 2026, 8:16 PM
  • https://bugzilla.redhat.com/show_bug.cgi?id=2460224bugzilla.redhat.com

    No excerpt available.

    Exploitbugzilla.redhat.comApr 21, 2026, 8:16 PM
  • https://access.redhat.com/security/cve/CVE-2026-40372access.redhat.com

    No excerpt available.

    Vendor Advisoryaccess.redhat.comApr 21, 2026, 8:16 PM

Exploit code

Public exploit repository references

Public PoC repositories are third-party, potentially unsafe artifacts. Treat their code as untrusted and use it only on authorized systems in an isolated, least-privilege environment. cvebuzz does not execute the code or verify that an exploit works.

0 repository references · best confidence N/A · max 0 stars
No public PoC repositories have been matched yet.

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