CVE-2026-40372 | Microsoft ASP.NET Core up to 10.0.6 signature verification

VDB-358597 · CVE-2026-40372 · GCVE-0-2026-40372 MICROSOFT ASP.NET CORE UP TO 10.0.6 SIGNATURE VERIFICATION HISTORYDIFFRELATEJSONXMLCTI CVSS Meta Temp Score Current Exploit Price (≈) CTI Interest Score 7.2 $5k-$25k 3.31+ Summaryinfo A vulnerability, which was classified as problematic, has been found in Microsoft ASP.NET Core up to 10.0.6. This affects an unknown function. This manipulation causes signature verification. This vulnerability is tracked as CVE-2026-40372. The attack is possible to be carried out remotely. No exploit exists. It is advisable to upgrade the affected component. Detailsinfo A vulnerability classified as problematic was found in Microsoft ASP.NET Core up to 10.0.6. Affected by this vulnerability is an unknown functionality. The manipulation with an unknown input leads to a signature verification vulnerability. The CWE definition for the vulnerability is CWE-347. The product does not verify, or incorrectly verifies, the cryptographic signature for data. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is: Improper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network. The advisory is shared at msrc.microsoft.com. This vulnerability is known as CVE-2026-40372 since 04/12/2026. The exploitation appears to be difficult. The attack can be launched remotely. The exploitation doesn't need any form of authentication. Neither technical details nor an exploit are publicly available. The price for an exploit might be around USD $5k-$25k at the moment (estimation calculated on 04/21/2026). Upgrading to version 10.0.7 eliminates this vulnerability. Productinfo Vendor Microsoft Name ASP.NET Core Version 10.0.0 10.0.1 10.0.2 10.0.3 10.0.4 10.0.5 10.0.6 License open-source Website Vendor: https://www.microsoft.com/ CPE 2.3info 🔒 🔒 🔒 CPE 2.2info 🔒 🔒 🔒 CVSSv4info VulDB Vector: 🔒 VulDB Reliability: 🔍 CVSSv3info VulDB Meta Base Score: 7.3 VulDB Meta Temp Score: 7.2 VulDB Base Score: 5.6 VulDB Temp Score: 5.4 VulDB Vector: 🔒 VulDB Reliability: 🔍 CNA Base Score: 9.1 CNA Vector (microsoft): 🔒 CVSSv2info Vector Complexity Authentication Confidentiality Integrity Availability Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock Unlock VulDB Base Score: 🔒 VulDB Temp Score: 🔒 VulDB Reliability: 🔍 Exploitinginfo Class: Signature verification CWE: CWE-347 / CWE-345 CAPEC: 🔒 ATT&CK: 🔒 Physical: No Local: No Remote: Yes Availability: 🔒 Status: Not defined Price Prediction: 🔍 Current Price Estimation: 🔒 0-Day Unlock Unlock Unlock Unlock Today Unlock Unlock Unlock Unlock Threat Intelligenceinfo Interest: 🔍 Active Actors: 🔍 Active APT Groups: 🔍 Countermeasuresinfo Recommended: Upgrade Status: 🔍 0-Day Time: 🔒 Upgrade: ASP.NET Core 10.0.7 Timelineinfo 04/12/2026 CVE reserved 04/21/2026 +9 days Advisory disclosed 04/21/2026 +0 days VulDB entry created 04/21/2026 +0 days VulDB entry last update Sourcesinfo Vendor: microsoft.com Advisory: msrc.microsoft.com Status: Confirmed CVE: CVE-2026-40372 (🔒) GCVE (CVE): GCVE-0-2026-40372 GCVE (VulDB): GCVE-100-358597 Entryinfo Created: 04/21/2026 22:38 Changes: 04/21/2026 22:38 (62) Complete: 🔍 Cache ID: 99:F97:101 Discussion No comments yet. Languages: en. Please log in to comment. ◂ PreviousOverviewNext ▸