Recorded 18 Oct 2026 at 14:54 UTC. This is what ChangeIntel recorded, including the title, summary, facts and links. It is not a statement of the source's current position. See the latest record.
.NET Remote Code Execution Vulnerability
Deserialization of untrusted data in .NET allows an unauthorized attacker to execute code over a network.
What it said
- CVE
- CVE-2026-87697
- Severity
- Important
- CVSS base score
- 8.8
- CVSS vector
- CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
- Impact
- Remote Code Execution
- Exploitation detected
- Not reported by MSRC
- Publicly disclosed
- No
- Exploitability
- Exploitation Less Likely
- Component
- .NET
- Weakness
- CWE-502: Deserialization of Untrusted Data
- Issued by
- Microsoft
- Customer action
- Required: apply the update
- Affected products
- .NET 10.0 installed on Windows, .NET 11.0 installed on Windows, .NET 8.0 installed on Windows, .NET 9.0 installed on Windows, Microsoft Visual Studio 2022 version 17.14, Microsoft Visual Studio 2026 version 18.10
- Updates that fix it
- KB5130034: .NET 8.0 installed on Windows (restart required); KB5130035: .NET 9.0 installed on Windows (restart required); KB5130036: .NET 10.0 installed on Windows (restart required)
- CISA KEV
- Not listed in the collected catalog
- EPSS
- 0.8%; scored 18 Oct 2026
- Public exploit code
- No Nuclei template listed
- Published
- 13 Oct 2026 07:00 UTC
- Last revised
- 15 Oct 2026 07:00 UTC
- Revision note
- Updated the Security Updates table to add KB article links for .NET 11.0 and download and KB article links for Microsoft Visual Studio. This is an informational change only; the fixed builds are unchanged.
Recorded links
Source evidence when recorded
- Microsoft security releases
- Complete at observationRead 18 Oct 2026 at 14:53 UTC
- CISA KEV
- Complete at observationRead 18 Oct 2026 at 14:53 UTC
- FIRST EPSS
- Complete at observationRead 18 Oct 2026 at 14:53 UTC
- Public exploit code
- Complete at observationRead 18 Oct 2026 at 14:53 UTC
Coverage describes the sources at this observation. A complete read then does not establish their current position.
What changed
First observed 14 Oct 2026- 18 Oct 2026 · 14:54:30 UTC EPSS0.8%; scored 16 Oct 2026 → 0.8%; scored 18 Oct 2026
- 18 Oct 2026 · 14:54:30 UTC Link: October 2026/security?release=2026-Oct#cves
- 16 Oct 2026 · 16:13:25 UTC EPSS0.8%; scored 15 Oct 2026 → 0.8%; scored 16 Oct 2026
- 15 Oct 2026 · 21:30:54 UTC Revision noteInformation published. → Updated the Security Updates table to add KB article links for .NET 11.0 and download and KB article links for Microsoft Visual Studio. This is an informational change only; the fixed builds are unchanged.
- 15 Oct 2026 · 21:30:54 UTC Last revised13 Oct 2026 07:00 UTC → 15 Oct 2026 07:00 UTC
- 15 Oct 2026 · 21:30:54 UTC EPSS0.8%; scored 14 Oct 2026 → 0.8%; scored 15 Oct 2026
- 15 Oct 2026 · 21:30:54 UTC Updates that fix itNo KB listed → KB5130034: .NET 8.0 installed on Windows (restart required); KB5130035: .NET 9.0 installed on Windows (restart required); KB5130036: .NET 10.0 installed on Windows (restart required)
- 15 Oct 2026 · 21:30:54 UTC Link: KB5130036/windows/kb/KB5130036
- 15 Oct 2026 · 21:30:54 UTC Link: KB5130035/windows/kb/KB5130035
- 15 Oct 2026 · 21:30:54 UTC Link: KB5130034/windows/kb/KB5130034
- 15 Oct 2026 · 01:07:54 UTC EPSSNot scored → 0.8%; scored 14 Oct 2026
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