What is CVE-2021-26642?

CVE-2021-26642 is a high-severity vulnerability in Microsoft Windows, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.8/10. Published 2023-01-20.

How severe is CVE-2021-26642?

High severity. CVSS v3 base score is 8.8 out of 10.

Arbitrary file upload in Microsoft Windows

CVE-2021-26642

When uploading an image file to a bulletin board developed with XpressEngine, a vulnerability in which an arbitrary file can be uploaded due to insufficient verification of the file. A remote attacker can use this vulnerability to execute arbitrary code on the server where the bulletin board is running.

Vulnerability class: Unrestricted File Upload

EPSS: 0.012 (64.0th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.

Affected products

Microsoft Windows
Xehub Xe3 Xpresesengine — versions 3.0.14
Xpressengine

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

vuln@krcert.or.kr (Third Party Advisory)

Frequently asked questions

What is CVE-2021-26642?: CVE-2021-26642 is a high-severity vulnerability in Microsoft Windows, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 8.8/10. Published 2023-01-20.
How severe is CVE-2021-26642?: High severity. CVSS v3 base score is 8.8 out of 10.