September 2026 Patch TuesdayKB5123731Normal patch window

Microsoft · KB5123731

Linked CVE review

Deploy Microsoft Microsoft Dynamics security update KB5123731

Linked CVEs
1
Confirmed exploited
0
PoC or lab evidence
0
Maximum CVSS
8.8
Evidence is kept separate

Confirmed exploitation, public exploit material, EPSS probability and CVSS severity answer different questions. “No confirmation recorded” means the checked sources do not currently confirm exploitation. It is not proof that exploitation has not occurred.

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1 of 1 linked CVEs shown
Confirmed exploitedCVSS above 9.0
CVE and descriptionSeverityExploit realityForecast and accessRemediation
CVE-2026-77908 Scheduled assessment
Microsoft Dynamics 365 On-Premises Remote Code Execution Vulnerability

Improper control of generation of code ('code injection') in Microsoft Dynamics 365 allows an authorized attacker to execute code over a network.

8.8 · CVSS 3.1 · HighSource: CNANo confirmation recordedNo CISA KEV match was present at the last successful refresh. This means no confirmation from that source, not proof of no exploitation.None recordedNo exploit-tagged reference or CISA SSVC proof-of-concept state is currently recorded. Research may still exist outside the structured feeds.EPSS: 0.99% · 61.3th percentileForecast date: 2026-10-08NETWORK · LOW complexity · LOW privileges · NONE user interactionWithin 7 daysHigh technical severity; prioritise exposed affected systems while verifying vendor guidance.Mitigation available. No fixed version is explicitly recorded in the structured CVE data.