What is CVE-2021-45786?

CVE-2021-45786 is a critical-severity vulnerability in Maccms, classified under Improper Authentication. CVSS score: 9.8/10. Published 2022-03-16.

How severe is CVE-2021-45786?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Is CVE-2021-45786 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Auth bypass in Maccms

CVE-2021-45786

In maccms v10, an attacker can log in through /index.php/user/login in the "col" and "openid" parameters to gain privileges.

Vulnerability class: Broken Authentication

Published 2022-03-16 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.012 (67.1th percentile), scored 2026-10-07.

Low probability of exploitation in the next 30 days, but still tracked. 67th percentile — 67.1% 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

Maccms — versions 10.0

Weakness classification (CWE)

CWE-287 — Improper Authentication

Public proof-of-concept exploits

ndouglas-cloudsmith/exploit-check

References

github.com/magicblack/maccms10/issues/747 (Exploit, Third Party Advisory, Issue Tracking)

Frequently asked questions

What is CVE-2021-45786?: CVE-2021-45786 is a critical-severity vulnerability in Maccms, classified under Improper Authentication. CVSS score: 9.8/10. Published 2022-03-16.
How severe is CVE-2021-45786?: Critical severity. CVSS v3 base score is 9.8 out of 10.
Is CVE-2021-45786 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.