Vulnerability · CVE-2026-108399
CVE-2026-108399 is listed by Microsoft Patch Tuesday for October 2026 — Snort rules and prominent vulnerabilities.
Published Oct 13, 2026 · Cisco Talos · evidence confidence high
CVE-2026-108399 is listed by Microsoft Patch Tuesday for October 2026 — Snort rules and prominent vulnerabilities.
Grounded briefings
Catalog interpretations for three audiences. Each brief cites ingested metadata and the original advisories below. They are not independent research and they do not invent exploit steps.
Executive
CVE-2026-108399 is a unknown public vulnerability record for Cisco Talos. It is not currently listed in the CISA Known Exploited catalog. Check the linked vendor or CERT advisories for patch status. This summary is a catalog interpretation of the ingested metadata and cites the original advisories below.
System administrator
Identify whether Cisco Talos is in your estate, then compare installed versions with the affected ranges. Affected version ranges have not been ingested yet. Check the linked vendor or CERT advisories for patch status. Prefer the vendor or distribution advisory linked in Sources before changing production systems. This is a catalog interpretation, not a runbook.
Security analyst
Signals on file: EPSS 0.3%. It is not currently listed in the CISA Known Exploited catalog. Sources contributing to this record: cve_org, epss, talos. Public exploit references, when present, are outbound links only and are not proof of active exploitation. This is a catalog interpretation of stored metadata.
Exploitation and remediation
Exploitation evidence
Not listed as known exploited in CISA KEV. Not in CISA KEV or VulnCheck KEV.
Patch and remediation
No required-action text is stored yet. Use the vendor or CERT links in Sources for patch availability.
Safe detection guidance
Compare installed versions with the affected ranges below and verify the advisory from the original publisher. This site stores metadata and outbound links only; it does not ship exploit code or proof-of-concept payloads.
Technology hubs
Code
The project this record applies to. Exploit listings stay in References.
No public source repository is identified for this product.
Timeline
Detection, updates, and resolution for this record.
Oct 13, 2026 · Cisco Talos
Detected
CVE-2026-108399 is listed by Microsoft Patch Tuesday for October 2026 — Snort rules and prominent vulnerabilities.
Sources
- CVE.orgVulnerability recordCVE-2026-108399
Official CVE identifier
cve.org - FIRST EPSSExploitation probabilityCVE-2026-108399
30-day exploitation probability 0.3%
first.org - Cisco TalosVendor advisoryCVE-2026-108399
Microsoft has released its monthly security update for October 2026, which includes 1415 vulnerabilities affecting a range of products, including 85 that Microsoft marked as "critical."
blog.talosintelligence.com