CVE-2021-26642: Unrestricted Upload of File with Dangerous Type

January 20, 2023 (updated February 8, 2023)

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.

References

boho.or.kr/krcert/secNoticeView.do?bulletin_writing_sequence=67125
github.com/advisories/GHSA-8r5j-22j5-w4cm
github.com/xpressengine/xpressengine/issues/1366
nvd.nist.gov/vuln/detail/CVE-2021-26642

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