CVE-2021-36548

Name: CVE-2021-36548
Creator: NVD / NIST
Published: 2021-10-28T20:15:07.533+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 3.20%

Last modified Jun 17, 2026

CVE-2021-36548 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. A remote code execution (RCE) vulnerability in the component /admin/index.php?id=themes&action=edit_template&filename=blog of Monstra v3.0.4 allows attackers to execute arbitrary commands via a crafted PHP file.. EPSS estimates a 3.20% chance of exploitation in the next 30 days.

Description

A remote code execution (RCE) vulnerability in the component /admin/index.php?id=themes&action=edit_template&filename=blog of Monstra v3.0.4 allows attackers to execute arbitrary commands via a crafted PHP file.

Metrics

CVSS 3.1

9.8/10

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS Probability

3.20%

86.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-434

Affected Software

Vendor	Product	Versions
Monstra	Monstra	3.0.4

References

https://github.com/monstra-cms/monstra/issues/470Exploit, Issue Tracking, Third Party Advisory
https://github.com/monstra-cms/monstra/issues/470Exploit, Issue Tracking, Third Party Advisory

Timeline

Published: Oct 28, 2021
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2021-36548?

How severe is CVE-2021-36548?

CVE-2021-36548 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 3.20% probability of exploitation in the next 30 days.

How do I fix CVE-2021-36548?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2021-36548?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST