Microsoft Configuration Manager: Information disclosure due to weak authentication
Summary
Weak authentication in Microsoft Configuration Manager allows an unauthenticated remote attacker to access confidential information. The attack complexity is high, and no user interaction or privileges are required. Microsoft rates the flaw as Important with a CVSS 3.1 score of 5.9, and the advisory does not describe the exact weakness or the data that can be disclosed.
Affected
- Microsoft Configuration Manager 2603, builds from 1.0.0 up to, but not including, 5.0.9146.1045
Fixed in
- Build 5.0.9146.1045 (according to the CVE record; not yet verified against the MSRC advisory)
Workaround
Unknown. No vendor-documented interim mitigation was found.
Exploitation
- Not exploited in the wild according to the available sources; no public proof of concept found.
- Rapid7 rates it "Exploitation Less Likely"; SANS ISC lists it as not disclosed and not exploited.
- CISA SSVC: exploitation none, not automatable.
Our recommendation
- Check whether Configuration Manager site servers or consoles are installed and which build they run.
- If affected, apply the update to build 5.0.9146.1045 or later after confirming it against the MSRC advisory.
- Confirm that the management infrastructure is not reachable from the internet.
- Monitor the MSRC entry for changes to the exploitation status.
Information from Microsoft (Patch Tuesday November 2026)
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-119991 msrc.microsoft.com
- CVE Record CVE-2026-119991 www.cve.org
- BleepingComputer: Microsoft November 2026 Patch Tuesday www.bleepingcomputer.com
- Rapid7: Patch Tuesday November 2026 www.rapid7.com
- SANS ISC Diary isc.sans.edu
- Strix: CVE-2026-119991 www.strix.ai
Researched and written up in English and German by an AI (Claude by Anthropic) based on NVD, CISA, EPSS and the sources listed. The vendor information is authoritative. Researched on 11 Nov 2026, 15:13.
Original description (NVD)
Weak authentication in Microsoft Configuration Manager allows an unauthorized attacker to disclose information over a network.
NVD references (1)
Sources
The tracker combines official, freely usable data sources – updated continuously:
- NVD (NIST) – CVEs, rating (CVSS), affected products
- CISA KEV – vulnerabilities confirmed by CISA as actively exploited
- CISA Vulnrichment – CISA assessment (SSVC) in the official CVE record
- FIRST EPSS – probability of exploitation
- Microsoft MSRC – Patch Tuesday: vulnerabilities, severity, updates
- PoC-in-GitHub – public proof-of-concept repositories
- Metasploit (Rapid7) – modules of the Metasploit Framework
- Exploit-DB (OffSec) – archive of public exploits (links only)
- Patch days: official vendor pages (linked per vendor) (Vendor patch days)
This product uses data from the NVD API but is not endorsed or certified by the NVD. EPSS data © FIRST.org.
Affected? We can help.
We check whether your systems are affected, install updates and close the gap – continuously with the System Health Checker if you wish.