What is CVE-2021-40639?

CVE-2021-40639 is a high-severity vulnerability in Jflyfox Jfinal Cms, classified under Exposure of Resource to Wrong Sphere. CVSS score: 7.5/10. Published 2021-09-15.

How severe is CVE-2021-40639?

High severity. CVSS v3 base score is 7.5 out of 10.

Auth bypass in Jflyfox Jfinal Cms

CVE-2021-40639

Improper access control in Jfinal CMS 5.1.0 allows attackers to access sensitive information via /classes/conf/db.properties&config=filemanager.config.js.

Published 2021-09-15 · last modified 2026-07-09.

CVSS v3 metric

CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N.

EPSS exploit prediction

EPSS: 0.012 (67.0th percentile), scored 2026-10-01.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.012 · newest: 0.012 · change: 0.000

Affected products

Jflyfox Jfinal Cms — versions 5.1.0

Weakness classification (CWE)

References

af854a3a-2127-422b-91ae-364da2661108 (Broken Link)
github.com/jflyfox/jfinal_cms (Product, Third Party Advisory)
github.com/jflyfox/jfinal_cms/issues/27 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-40639?: CVE-2021-40639 is a high-severity vulnerability in Jflyfox Jfinal Cms, classified under Exposure of Resource to Wrong Sphere. CVSS score: 7.5/10. Published 2021-09-15.
How severe is CVE-2021-40639?: High severity. CVSS v3 base score is 7.5 out of 10.