CVE-2021-26642

Name: CVE-2021-26642
Creator: NVD / NIST
Published: 2023-01-20T17:15:10.3+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 1.16%

Last modified Jun 17, 2026

CVE-2021-26642 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 1.16% chance of exploitation in the next 30 days.

Description

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.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

1.16%

63.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Xpressengine	Xpressengine	< 3.0.14

References

https://boho.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=67125Third Party Advisory
https://boho.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=67125Third Party Advisory

Timeline

Published: Jan 20, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-26642?

How severe is CVE-2021-26642?

CVE-2021-26642 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 1.16% probability of exploitation in the next 30 days.

How do I fix CVE-2021-26642?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-26642?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST