CVE-2026-70187CriticalFix has a known issueRCENetwork

Windows Remote Desktop Services Remote Code Execution Vulnerability

MSRC advisory NVD CVE.org

Assessment

Use after free in Remote Desktop Gateway Service allows an unauthorized attacker to execute code over a network.

Severity: Critical
CVSS base score: 8.1CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
Impact: Remote Code Execution
EPSS, next 30 days: 0.8%Higher than 55.6% of scored CVEs · FIRST model run 25 Oct 2026 · about EPSS
Public exploit code: No Nuclei template lists it
Exploitability: Exploitation Less Likely
Publicly disclosed: No
Customer action: Required: apply the update
Component: Remote Desktop Gateway Service
Weakness: CWE-416: Use After Free
Issued by: Microsoft
Published: 13 Oct 2026 · October 2026
Last revised: 13 Oct 2026

CVSS 3.1 base metricsRed raises the risk · green lowers it

Attack vector: NetworkAV:N
Attack complexity: HighAC:H
Privileges required: NonePR:N
User interaction: NoneUI:N
Scope: UnchangedS:U
Confidentiality: HighC:H
Integrity: HighI:H
Availability: HighA:H

Updates that fix it

6 KBs

KB	Type	Restart	Applies to	Known issues	Other CVEs
KB5126646	Security Update	Required	Windows Server 2025, Windows Server 2025 (Server Core installation)	MitigatedUsers might be unable to sign in to OWA or send emails on Exchange Server	All CVEs in KB5126646
KB5126651	Security Update	Required	Windows Server 2019, Windows Server 2019 (Server Core installation)	MitigatedUsers might be unable to sign in to OWA or send emails on Exchange Server	All CVEs in KB5126651
KB5126655	Security Update	Required	Windows Server 2022, Windows Server 2022 (Server Core installation)	MitigatedUsers might be unable to sign in to OWA or send emails on Exchange Server	All CVEs in KB5126655
KB5126835	Security Update	Required	Windows Server 2012, Windows Server 2012 (Server Core installation)	None listed	All CVEs in KB5126835
KB5126836	Security Update	Required	Windows Server 2012 R2, Windows Server 2012 R2 (Server Core installation)	None listed	All CVEs in KB5126836
KB5126868	Security Update	Required	Windows Server 2016, Windows Server 2016 (Server Core installation)	MitigatedUsers might be unable to sign in to OWA or send emails on Exchange Server	All CVEs in KB5126868

Independent patch analysis

Cisco Talos Intelligence

Microsoft Patch Tuesday for October 2026 — Snort rules and prominent vulnerabilities · 13 Oct 2026

Talos supplies analysis and cycle-level Snort rule references. Its article does not map each rule to a CVE or establish protection for your deployment. MSRC remains the source for vulnerability and fixing-update facts.

What changed

First observed 14 Oct 2026

25 Oct 2026 · 17:12:51 UTC EPSS0.7%; scored 24 Oct 2026 → 0.8%; scored 25 Oct 2026
25 Oct 2026 · 01:34:18 UTC EPSS0.7%; scored 23 Oct 2026 → 0.7%; scored 24 Oct 2026
23 Oct 2026 · 15:51:28 UTC EPSS0.7%; scored 22 Oct 2026 → 0.7%; scored 23 Oct 2026
23 Oct 2026 · 09:33:49 UTC Public exploit codeUnknown: exploit-code evidence is incomplete or retained → No Nuclei template listed
23 Oct 2026 · 09:33:49 UTC CISA KEVUnknown: catalog evidence is incomplete or retained → Not listed in the collected catalog
23 Oct 2026 · 09:33:49 UTC Source coverage: public-exploit-codeIncomplete → Current
23 Oct 2026 · 09:33:49 UTC Source coverage: first-epssIncomplete → Current
23 Oct 2026 · 09:33:49 UTC Source coverage: cisa-kevIncomplete → Current
23 Oct 2026 · 09:33:49 UTC Source coverage: msrc-cvrfIncomplete → Current
23 Oct 2026 · 08:31:50 UTC Public exploit codeNo Nuclei template listed → Unknown: exploit-code evidence is incomplete or retained
23 Oct 2026 · 08:31:50 UTC CISA KEVNot listed in the collected catalog → Unknown: catalog evidence is incomplete or retained
23 Oct 2026 · 08:31:50 UTC Source coverage: public-exploit-codeCurrent → Incomplete

Show 13 more recent changes

23 Oct 2026 · 08:31:50 UTCSource coverage: first-epss Current → Incomplete
23 Oct 2026 · 08:31:50 UTCSource coverage: cisa-kev Current → Incomplete
23 Oct 2026 · 08:31:50 UTCSource coverage: msrc-cvrf Current → Incomplete
22 Oct 2026 · 17:33:15 UTCEPSS 0.7%; scored 21 Oct 2026 → 0.7%; scored 22 Oct 2026
21 Oct 2026 · 21:47:24 UTCEPSS 0.7%; scored 20 Oct 2026 → 0.7%; scored 21 Oct 2026
20 Oct 2026 · 20:53:31 UTCEPSS 0.7%; scored 19 Oct 2026 → 0.7%; scored 20 Oct 2026
19 Oct 2026 · 15:12:40 UTCEPSS 0.7%; scored 18 Oct 2026 → 0.7%; scored 19 Oct 2026
19 Oct 2026 · 15:12:40 UTCLink: Cisco Talos analysis → https://blog.talosintelligence.com/microsoft-patch-tuesday-for-october-2026
18 Oct 2026 · 14:54:30 UTCEPSS 0.7%; scored 16 Oct 2026 → 0.7%; scored 18 Oct 2026
18 Oct 2026 · 14:54:30 UTCLink: October 2026 → /security?release=2026-Oct#cves
16 Oct 2026 · 16:13:25 UTCEPSS 0.7%; scored 15 Oct 2026 → 0.7%; scored 16 Oct 2026
15 Oct 2026 · 21:30:54 UTCEPSS 0.7%; scored 14 Oct 2026 → 0.7%; scored 15 Oct 2026
15 Oct 2026 · 01:07:54 UTCEPSS Not scored → 0.7%; scored 14 Oct 2026

The most recent 100 field changes are listed. Complete recorded revisions are kept separately.

Cite this recorded revision to keep the same title, summary, facts and links when the page changes.

A day selects the latest observation by the end of that UTC day; today's selection can change until midnight. History starts when this installation records it.

Explore global source statements, affected packages and advisory history for CVE-2026-70187. The catalog has a separate collection scope from Microsoft release records.

Collected exploitation and prediction evidence

Risk source coverage

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

Dated risk observations

Risk history is separate from CNA/OSV content history. Daily score drift is retained but only an upward crossing of 10% triggers the prediction change event.

Immutable source observations

5 recorded revisions

Each citation identifies one complete source statement. Source modification dates and the time this installation observed them are distinct. Latest history includes records historically associated by source identifiers; a removed alias is not a current equivalence claim. Exact citations show that source record's own earlier observations. Failed reads and unchanged polls do not rewrite history.

25 Oct 2026 20:02:02 UTC