BlackTreeCVE Intelligence
September 2026 Patch TuesdayMSRC-2026-09-developer-tools-11-0-rc1Normal patch window

Microsoft · MSRC-2026-09-developer-tools-11-0-rc1

Linked CVE review

Deploy Microsoft Developer Tools update for .NET 11.0 installed on Mac OS

Linked CVEs
1
Confirmed exploited
0
PoC or lab evidence
0
Maximum CVSS
6.5
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-2026-58649 Scheduled assessment
.NET Information Disclosure Vulnerability

Origin validation error in .NET allows an unauthorized attacker to disclose information over a network.

6.5 · CVSS 3.1 · MediumSource: 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: 0.27% · 17.2th percentileForecast date: 2026-10-09NETWORK · LOW complexity · NONE privileges · REQUIRED user interactionScheduledMedium technical severity with no CISA KEV confirmation; remediate through the normal risk-based patch cycle unless local exposure raises the priority.Patch available. For details on how to apply this update, which includes the changes described in this advisory, refer to: https://access.redhat.com/articles/11258