Windows: Elevation of privilege in Function Discovery Resource Publication
Summary
The Windows service Function Discovery Resource Publication (FDResPub) contains an untrusted pointer dereference (CWE-822). An authorized local attacker with low privileges can elevate their rights to SYSTEM. Exploitation requires local access and a valid low-privileged account, so it is not remotely exploitable. Microsoft rates exploitation as unproven and not automatable.
Affected
- Windows 10 Version 1607 (10.0.14393.0 to before 10.0.14393.9688)
- Windows 10 Version 1809 (10.0.17763.0 to before 10.0.17763.9487)
- Windows 10 Version 21H2 (10.0.19044.0 to before 10.0.19044.7846)
- Windows 10 Version 22H2 (10.0.19045.0 to before 10.0.19045.7846)
- Windows 11 Version 23H2 (10.0.22631.0 to before 10.0.22631.7711)
- Windows 11 Version 24H2 (10.0.26100.0 to before 10.0.26100.9974)
- Windows 11 Version 25H2 (10.0.26200.0 to before 10.0.26200.9974)
- Windows 11 Version 26H1 (10.0.28000.0 to before 10.0.28000.3501)
- Windows 11 Version 26H2 (10.0.26300.0 to before 10.0.26300.9974)
- Windows Server 2016, including Server Core (10.0.14393.0 to before 10.0.14393.9688)
- Windows Server 2019, including Server Core (10.0.17763.0 to before 10.0.17763.9487)
- Windows Server 2022 (10.0.20348.0 to before 10.0.20348.5870)
Fixed in
- Fixed in the November 2026 security update (Patch Tuesday, 10 Nov 2026), the first build at or above the listed number.
- Fixed builds per the CVE record: 10.0.14393.9688, 10.0.17763.9487, 10.0.19044.7846, 10.0.19045.7846, 10.0.22631.7711, 10.0.26100.9974, 10.0.26200.9974, 10.0.28000.3501, 10.0.26300.9974, 10.0.20348.5870.
- KB numbers: Unknown.
- Windows 11 23H2: a press report names KB5131087 with build 22631.7582, which conflicts with 22631.7711. Verify on MSRC.
Workaround
- Vendor mitigation: None found. Installing the update is the fix.
- Unconfirmed analogue: For the related June 2026 bug CVE-2026-42836, a third-party article suggests disabling Function Discovery Provider Host (fdPHost) and Function Discovery Resource Publication (FDResPub) if they are not required. This is not confirmed for CVE-2026-119907 and must be tested first.
Exploitation
- CISA SSVC: Exploitation none, automatable no, technical impact total.
- CVSS temporal vector: E:U (exploit code maturity unproven).
- In the wild: No evidence found for this CVE.
- Public proof of concept: None found.
Our recommendation
- Install the November 2026 cumulative update on all affected systems and verify the fixed build on the MSRC advisory first.
- Check whether Windows 10 1607, 1809 or 21H2 systems have ESU or another valid servicing option, and plan upgrades.
- Prioritise shared hosts, terminal servers and systems where users can run untrusted code.
- Disable FDResPub and related Function Discovery services only where they are not needed, after testing.
- Monitor for unexpected privilege escalation on endpoints.
Information from Microsoft (Patch Tuesday November 2026)
- Severity (Microsoft)
- Important
- Impact
- Elevation of privilege – Windows Function Discovery Resource Publication
- Status on Patch Tuesday
- Neither exploited nor publicly disclosed
- Exploitability assessment
- Exploitation less likely
- Product family
- Windows, Windows ESU (Extended Security Updates)
- Updates (KB)
- KB5131291, KB5131085, KB5131096, KB5131090, KB5131087, KB5132061
Public exploits
PoC-in-GitHub, Metasploit and Exploit-DB list nothing for this CVE.
Research sources
- Microsoft Security Update Guide: CVE-2026-119907 msrc.microsoft.com
- CVE Record: CVE-2026-119907 www.cve.org
- Neowin: Windows 11 KB5132061/KB5131087 November 2026 update www.neowin.net
- Windows News: CVE-2026-42836 (analogue, not confirmed for this CVE) windowsnews.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, 03:42.
Original description (NVD)
Untrusted pointer dereference in Windows Function Discovery Resource Publication allows an authorized attacker to elevate privileges locally.
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.
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