CVE-2026-20817
Windows Error Reporting Service Elevation of Privilege Vulnerability
Description
Improper handling of insufficient permissions or privileges in Windows Error Reporting allows an authorized attacker to elevate privileges locally.
INFO
Published Date :
Jan. 13, 2026, 6:16 p.m.
Last Modified :
Jan. 14, 2026, 8:31 p.m.
Remotely Exploit :
No
Source :
[email protected]
Affected Products
The following products are affected by CVE-2026-20817
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | f38d906d-7342-40ea-92c1-6c4a2c6478c8 | ||||
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Apply the latest Windows security updates.
- Ensure all Windows operating systems are current.
Public PoC/Exploit Available at Github
CVE-2026-20817 has a 4 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-20817.
| URL | Resource |
|---|---|
| https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20817 | Vendor Advisory |
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-20817 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-20817
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Windows Error Reporting ALPC Elevation of Privilege (CVE-2026-20817) - Proof-of-Concept exploit demonstrating local privilege escalation via WER service.
C++
TOP All bugbounty pentesting CVE-2023- POC Exp RCE example payload Things
bugbounty cve exp exploit payload poc rce vulnerability
Shell
📡 PoC auto collect from GitHub. ⚠️ Be careful Malware.
security cve exploit poc vulnerability
爬取secwiki和xuanwu.github.io/sec.today,分析安全信息站点、安全趋势、提取安全工作者账号(twitter,weixin,github等)
Python HTML
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-20817 vulnerability anywhere in the article.
-
CybersecurityNews
Windows Error Reporting Service Vulnerability Let Attackers Elevate Privileges – PoC Released
Windows Error Reporting Vulnerability A critical security flaw in Windows Error Reporting Service has been discovered, allowing attackers with standard user access to escalate their privileges to SYST ... Read more
-
The Cyber Express
Microsoft Patch Tuesday January 2026: Actively Exploited Zero Day, 8 High-Risk Flaws
Microsoft’s Patch Tuesday January 2026 update includes fixes for one actively-exploited zero day vulnerability and eight additional high-risk flaws. In all, the Patch Tuesday January 2026 update inclu ... Read more
-
Zero Day Initiative
The January 2026 Security Update Review
I may be in Tokyo preparing for Pwn2Own Automotive, but that doesn’t stop patch Tuesday from coming. Put aside you broken New Year’s resolutions for just a moment as we review the latest security patc ... Read more
-
BleepingComputer
Microsoft January 2026 Patch Tuesday fixes 3 zero-days, 114 flaws
Today is Microsoft's January 2026 Patch Tuesday with security updates for 114 flaws, including one actively exploited and two publicly disclosed zero-day vulnerabilities.This Patch Tuesday also addres ... Read more
-
CybersecurityNews
Microsoft Patch Tuesday January 2026 – 114 Vulnerabilities Fixed Including 3 Zero-days
CVE-2026-20822Windows Graphics Component Elevation of Privilege VulnerabilityElevation of PrivilegeCVE-2026-20876Windows Virtualization-Based Security (VBS) Enclave Elevation of Privilege Vulnerabilit ... Read more
The following table lists the changes that have been made to the
CVE-2026-20817 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Jan. 14, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:o:microsoft:windows_10_21h2:*:*:*:*:*:*:*:* versions up to (excluding) 10.0.19044.6809 *cpe:2.3:o:microsoft:windows_10_22h2:*:*:*:*:*:*:*:* versions up to (excluding) 10.0.19045.6809 *cpe:2.3:o:microsoft:windows_11_23h2:*:*:*:*:*:*:*:* versions up to (excluding) 10.0.22631.6491 *cpe:2.3:o:microsoft:windows_11_24h2:*:*:*:*:*:*:*:* versions up to (excluding) 10.0.26100.7623 *cpe:2.3:o:microsoft:windows_11_25h2:*:*:*:*:*:*:*:* versions up to (excluding) 10.0.26200.7623 *cpe:2.3:o:microsoft:windows_server_2022:*:*:*:*:*:*:*:* versions up to (excluding) 10.0.20348.4648 *cpe:2.3:o:microsoft:windows_server_2022_23h2:*:*:*:*:*:*:*:* versions up to (excluding) 10.0.25398.2092 *cpe:2.3:o:microsoft:windows_server_2025:*:*:*:*:*:*:*:* versions up to (excluding) 10.0.26100.32230 Added Reference Type Microsoft Corporation: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20817 Types: Vendor Advisory -
New CVE Received by [email protected]
Jan. 13, 2026
Action Type Old Value New Value Added Description Improper handling of insufficient permissions or privileges in Windows Error Reporting allows an authorized attacker to elevate privileges locally. Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-280 Added Reference https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-20817