What is CVE-2020-21356?

CVE-2020-21356 is a medium-severity vulnerability in Popojicms, classified under Exposure of Resource to Wrong Sphere. CVSS score: 5.3/10. Published 2021-08-06.

How severe is CVE-2020-21356?

Medium severity. CVSS v3 base score is 5.3 out of 10.

Vulnerability in Popojicms

CVE-2020-21356

An information disclosure vulnerability in upload.php of PopojiCMS 1.2 leads to physical path disclosure of the host when 'name = "file" is deleted during file uploads.

Published 2021-08-06 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.3 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.009 (58.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 58th percentile — 58.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000

Affected products

Popojicms — versions 1.2

Weakness classification (CWE)

CWE-668 — Exposure of Resource to Wrong Sphere

References

github.com/PopojiCMS/PopojiCMS/issues/23 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2020-21356?: CVE-2020-21356 is a medium-severity vulnerability in Popojicms, classified under Exposure of Resource to Wrong Sphere. CVSS score: 5.3/10. Published 2021-08-06.
How severe is CVE-2020-21356?: Medium severity. CVSS v3 base score is 5.3 out of 10.