What is CVE-2026-21860?

CVE-2026-21860 is a security advisory published by Microsoft Security Response Center (MSRC) with Medium severity. Werkzeug safe_join() allows Windows special device names with compound extensions

Which CVE IDs does CVE-2026-21860 cover?

CVE-2026-21860 covers the following CVE IDs: CVE-2026-21860. Each CVE has its own detail page on EchelonGraph Pulse with the synthesized EG score.

What is the CVSS v3 score of CVE-2026-21860?

CVE-2026-21860 has a CVSS v3 base score of 5.3, published by Microsoft Security Response Center (MSRC).

CVE-2026-21860MediumCVSS 5.3

Werkzeug safe_join() allows Windows special device names with compound extensions

Vendor

Microsoft Security Response Center (MSRC)

Published

June 2, 2026

Last Modified

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🔗 CVE IDs covered (1)

CVE-2026-21860 →