--- id: CVE-2026-96238 title: >- Origin validation error in .NET allows an unauthorized attacker to bypass a security feature over a network. summary: >- Origin validation error in .NET allows an unauthorized attacker to bypass a security feature over a network. severity: medium cvss: 6.5 cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:H/A:N' cwe: - CWE-346 - CWE-427 published: '2026-10-13' updated: '2026-10-13' sourceUpdated: '2026-10-13T20:19:15.233' source: NVD sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-96238' references: - url: 'https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-96238' label: secure@microsoft.com - url: >- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-96238.json - url: 'https://access.redhat.com/security/cve/CVE-2026-96238' - url: 'https://bugzilla.redhat.com/show_bug.cgi?id=2548809' - url: 'https://www.cve.org/CVERecord?id=CVE-2026-96238' - url: 'https://nvd.nist.gov/vuln/detail/CVE-2026-96238' - url: 'https://access.redhat.com/errata/RHSA-2026:86195' - url: 'https://access.redhat.com/errata/RHSA-2026:86168' - url: 'https://access.redhat.com/errata/RHSA-2026:86172' - url: 'https://access.redhat.com/errata/RHSA-2026:86192' - url: 'https://access.redhat.com/errata/RHSA-2026:86594' - url: 'https://access.redhat.com/errata/RHSA-2026:86170' - url: 'https://access.redhat.com/errata/RHSA-2026:86193' - url: 'https://access.redhat.com/errata/RHSA-2026:86169' - url: 'https://access.redhat.com/errata/RHSA-2026:86171' - url: 'https://access.redhat.com/errata/RHSA-2026:84491' - url: 'https://access.redhat.com/errata/RHSA-2026:84693' - url: 'https://access.redhat.com/errata/RHSA-2026:84424' - url: 'https://access.redhat.com/errata/RHSA-2026:88474' - url: 'https://access.redhat.com/errata/RHSA-2026:88424' - url: 'https://access.redhat.com/errata/RHSA-2026:88425' - url: 'https://access.redhat.com/errata/RHSA-2026:88422' tags: - nvd - cve.org - csaf - vex - red-hat ingestedAt: '2026-10-13T19:43:29.255Z' vendor: Microsoft product: .NET 10.0 affected: - .net_10.0 >= 10.0.0 < 10.0.113 - .net_11.0 >= 11.0.0 < 11.0.100-rc.2 - .net_8.0 >= 8.0.0 < 8.0.426 - .net_9.0 >= 9.0.0 < 9.0.122 - visual_studio_2022_version_17.14 >= 17.14.0 < 17.14.42 - visual_studio_2026_version_18.10 >= 18.10.0 < 18.10.4 ssvc: exploitation: none automatable: 'no' technicalImpact: partial timestamp: '2026-10-13T19:46:15.523484Z' epss: 0.00296 epssPercentile: 0.2243 patched: - enterprise_linux_appstream_v_10 - enterprise_linux_appstream_v_8 - enterprise_linux_appstream_v_9 - enterprise_linux_codeready_linux_builder_v_10 - enterprise_linux_crb_v_8 - enterprise_linux_codeready_linux_builder_v_9 - hardened_images --- ## Overview Origin validation error in .NET allows an unauthorized attacker to bypass a security feature over a network. ## Remediation Refer to the linked advisories for vendor-supplied fixes and affected version ranges. ## Vendor advisories - **RHSA-2026:86195** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:86195) - **RHSA-2026:86168** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:86168) - **RHSA-2026:86172** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:86172) - **RHSA-2026:86192** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:86192) - **RHSA-2026:86594** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-10-21 · [advisory](https://access.redhat.com/errata/RHSA-2026:86594) - **RHSA-2026:86170** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:86170) - **RHSA-2026:86193** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:86193) - **RHSA-2026:86169** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:86169) - **RHSA-2026:86171** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · released 2026-10-20 · [advisory](https://access.redhat.com/errata/RHSA-2026:86171) - **RHSA-2026:84491** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-18 · [advisory](https://access.redhat.com/errata/RHSA-2026:84491) - **RHSA-2026:84693** · Red Hat · fixed in: Red Hat Hardened Images · released 2026-10-19 · [advisory](https://access.redhat.com/errata/RHSA-2026:84693) - **RHSA-2026:88474** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) · released 2026-10-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:88474) - **RHSA-2026:88424** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v. 10.0), Red Hat Enterprise Linux CodeReady Linux Builder EUS (v. 10.0) · released 2026-10-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:88424) - **RHSA-2026:88425** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream E4S (v.9.4) · released 2026-10-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:88425) - **RHSA-2026:88422** · Red Hat · fixed in: Red Hat Enterprise Linux AppStream EUS (v.9.6), Red Hat CodeReady Linux Builder EUS (v.9.6) · released 2026-10-22 · [advisory](https://access.redhat.com/errata/RHSA-2026:88422)