What is CVE-2021-27280?

CVE-2021-27280 is a high-severity vulnerability in Mblog Project, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 7.8/10. Published 2023-05-08.

How severe is CVE-2021-27280?

High severity. CVSS v3 base score is 7.8 out of 10.

Arbitrary file upload in Mblog Project

CVE-2021-27280

OS Command injection vulnerability in mblog 3.5.0 allows attackers to execute arbitrary code via crafted theme when it gets selected.

Vulnerability class: Unrestricted File Upload

Published 2023-05-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.010 (60.7th percentile), scored 2026-10-03.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 61st percentile — 60.7% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.010 · newest: 0.010 · change: 0.000

Affected products

Mblog Project — versions 3.5.0

Weakness classification (CWE)

CWE-434 — Unrestricted Upload of File with Dangerous Type

References

github.com/langhsu/mblog/issues/44 (Exploit, Issue Tracking)
github.com/langhsu/mblog/ (Product)

Frequently asked questions

What is CVE-2021-27280?: CVE-2021-27280 is a high-severity vulnerability in Mblog Project, classified under Unrestricted Upload of File with Dangerous Type. CVSS score: 7.8/10. Published 2023-05-08.
How severe is CVE-2021-27280?: High severity. CVSS v3 base score is 7.8 out of 10.