What is CVE-2021-21495?

CVE-2021-21495 is a high-severity vulnerability in Mk-Auth, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2021-01-04.

How severe is CVE-2021-21495?

High severity. CVSS v3 base score is 8.8 out of 10.

CSRF in Mk-Auth

CVE-2021-21495

MK-AUTH through 19.01 K4.9 allows CSRF for password changes via the central/executar_central.php?acao=altsenha_princ URI.

Vulnerability class: CSRF (Cross-Site Request Forgery)

Published 2021-01-04 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.005 (42.9th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 43rd percentile — 42.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.005 · newest: 0.005 · change: +0.000

Affected products

Mk-Auth

Weakness classification (CWE)

CWE-352 — Cross-Site Request Forgery (CSRF)

References

mk-auth.com.br/ (Product, Vendor Advisory)
gist.github.com/alacerda/98853283be6009e75b7d94968d50b88e (Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-21495?: CVE-2021-21495 is a high-severity vulnerability in Mk-Auth, classified under Cross-Site Request Forgery (CSRF). CVSS score: 8.8/10. Published 2021-01-04.
How severe is CVE-2021-21495?: High severity. CVSS v3 base score is 8.8 out of 10.