{"answers":{"affected":"3 open source packages ship an affected version, including Microsoft.AspNetCore.DataProtection and aspnet-core. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-40372 in the wild and no public exploit code.","fix":"Upgrade Microsoft.AspNetCore.DataProtection to 10.0.7 or later.","what":"CVE-2026-40372 is a critical authentication bypass vulnerability in Microsoft ASP.NET Core 10.0, published on 21 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-40372 and fix it if it is affected.\n\nWhat it is: CVE-2026-40372 is a critical authentication bypass vulnerability in Microsoft ASP.NET Core 10.0, published on 21 Apr 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2026-40372 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- Microsoft.AspNetCore.DataProtection (NuGet): affected from 10.0.0; fixed in 10.0.7\n- Microsoft.AspNetCore.DataProtection (NuGet): affected from 10.0.0; fixed in 10.0.7\n- aspnet-core (Bitnami): affected from 10.0.0; fixed in 10.0.7\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/CVE-2026-40372/ (Markdown: https://insights.sbomify.com/CVE-2026-40372/index.md)","id":"CVE-2026-40372","markdown":"https://insights.sbomify.com/CVE-2026-40372/index.md","name":"CVE-2026-40372","record":{"aliases":["BIT-aspnet-core-2026-40372","GHSA-9mv3-2cwr-p262","UBUNTU-CVE-2026-40372"],"analysis":{"component_type":"web_application","fix_type":"patch","impacts":["privilege_escalation"],"network_reachable":"yes","non_default_config":false,"product_category":"ASP.NET Core framework","requires_auth":"none","summary":"An attacker can elevate privileges by exploiting improper cryptographic signature verification in ASP.NET Core.","user_interaction":"not_required","vuln_class":"auth_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"microsoft","cpe":[{"product":"asp.net_core","vendor":"microsoft"}],"cvss":{"score":9.1,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N/E:U/RL:O/RC:C","version":"3.1"},"cwes":[{"id":"CWE-347","name":"Improper Verification of Cryptographic Signature"}],"description":"Improper verification of cryptographic signature in ASP.NET Core allows an unauthorized attacker to elevate privileges over a network.","ecosystems":["Bitnami","NuGet"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"ASP.NET Core Elevation of Privilege Vulnerability","id":"CVE-2026-40372","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":null,"products":[],"type":"auth_bypass","year":"2026"},"n_packages":3,"n_references":1,"next":{"headline":"Microsoft Power Automate Desktop Information Disclosure Vulnerability","id":"CVE-2026-40374"},"packages":[{"ecosystem":"Bitnami","fixed":["10.0.7"],"introduced":["10.0.0"],"last_affected":[],"package":"aspnet-core","purl":"pkg:bitnami/aspnet-core","source":"BIT-aspnet-core-2026-40372"},{"ecosystem":"NuGet","fixed":["10.0.7"],"introduced":["10.0.0"],"last_affected":[],"package":"Microsoft.AspNetCore.DataProtection","purl":null,"source":"GHSA-9mv3-2cwr-p262"},{"ecosystem":"NuGet","fixed":["10.0.7"],"introduced":["10.0.0"],"last_affected":[],"package":"Microsoft.AspNetCore.DataProtection","purl":"pkg:nuget/Microsoft.AspNetCore.DataProtection","source":"GHSA-9mv3-2cwr-p262"}],"prev":{"headline":"Microsoft Dynamics 365 (on-premises) Elevation of Privilege Vulnerability","id":"CVE-2026-40371"},"products":["ASP.NET Core 10.0","Microsoft Visual Studio 2026 version 18.5"],"published":"2026-04-21","related":[{"cvss_score":9.9,"headline":"ASP.NET Security Feature Bypass Vulnerability","id":"CVE-2025-55315","kev_date_added":null,"published":"2025-10-14"},{"cvss_score":9.4,"headline":"ASP.NET Core Tampering Vulnerability","id":"CVE-2026-88092","kev_date_added":null,"published":"2026-10-13"},{"cvss_score":8.8,"headline":"ASP.NET Core and Visual Studio Elevation of Privilege Vulnerability","id":"CVE-2021-43877","kev_date_added":null,"published":"2021-12-15"},{"cvss_score":8.8,"headline":"Remote code execution in ASP.NET Core","id":"CVE-2020-0603","kev_date_added":null,"published":"2020-01-14"},{"cvss_score":8.8,"headline":"Elevation of privilege in ASP.NET Core","id":"CVE-2019-1302","kev_date_added":null,"published":"2019-09-11"},{"cvss_score":8.8,"headline":"ASP.NET Core allow an elevation of privilege","id":"CVE-2018-0787","kev_date_added":null,"published":"2018-03-14"}],"sources":[{"class":"attribution","licence":"Apache-2.0","name":"Bitnami","prefix":"BIT"},{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"total"},"state":"PUBLISHED","updated":"2026-10-15","vendors":["Microsoft"]},"summary":"An attacker can elevate privileges by exploiting improper cryptographic signature verification in ASP.NET Core.","url":"https://insights.sbomify.com/CVE-2026-40372/"}