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VulnerabilityCVE-2026-20841Published 2026-02-10

CVE-2026-20841 — Microsoft Windows Notepad

highPublic exploit10 PoC repos

As of 2026-08-19, CVE-2026-20841 is a HIGH-severity vulnerability in Microsoft Windows Notepad, CVSS v3.1 7.8, EPSS 9.0% (95.1th percentile). Threadlinqs Intelligence links 1 tracked threat campaign to CVE-2026-20841, most recently “CVE-2026-20841: Command Injection in Windows Notepad Markdown Link Handling Enables Arbitrary Code Execution”.

CVSS v3.1
7.8/10High
EPSS
9.0%Higher than 95.1% of scored CVEs
CISA KEV
NoNot in the KEV catalog
Tracked threats
1Campaigns referencing it
Priority
9.7/10Threadlinqs triage score
Published
Updated 2026-08-19
CVSS v3.1 7.8 (HIGH) · EPSS 9.0% (higher than 95.1% of all scored CVEs) · Priority 9.7/10 · Published 2026-02-10

Last updated:

What is CVE-2026-20841?

Improper neutralization of special elements used in a command ('command injection') in Windows Notepad App allows an unauthorized attacker to execute code locally.

The record classifies CVE-2026-20841 under weakness class CWE-77. Its CVSS v3 base vector states that the flaw requires local access to the host, needs no prior authentication, needs a user to take an action first, and has high impact on confidentiality, integrity, availability. 1 affected-product entry is recorded, across 1 vendor, listed below. The identifier was first published 263 days ago.

Severity and exploitation probability

CVSS v3.1 base score
7.8 — HIGH
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H/E:U/RL:O/RC:C
EPSS (FIRST)
9.0% probability of exploitation in the next 30 days, higher than 95.1% of all scored CVEs
CISA KEV
Not listed in the CISA Known Exploited Vulnerabilities catalog
Threadlinqs priority
9.7/10 — a Threadlinqs composite of the CVSS base score, the EPSS percentile and public exploit availability
Published
2026-02-10, last modified 2026-08-19

Is CVE-2026-20841 being exploited?

Weaponised exploit code for CVE-2026-20841 is publicly available. 10 public proof-of-concept repositories are tracked for this identifier. It currently carries a trending score of 37 in the Threadlinqs vulnerability feed.

Affected products and versions

How to fix CVE-2026-20841

No vendor patch reference has been recorded for CVE-2026-20841 in the tracked sources. Follow the references below for a fix, and treat the products listed above as exposed until the vendor states otherwise.

Threat activity tracking CVE-2026-20841

1 tracked threat in the Threadlinqs corpus references CVE-2026-20841, either in the campaign’s CVE list or as an indicator on the campaign record.

Sources

Enriched from CVE.org, FIRST EPSS, public proof-of-concept repositories. Last verified by Threadlinqs on .

Vendor advisory and patch