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CVE-2021-43281

7.2 · HIGH

MyBB before 1.8.29 allows Remote Code Injection by an admin with the "Can manage settings?" permission.

Published Nov 4, 2021CWE-94EPSS 1.33%

Overview

CVE-2021-43281 is a high-severity vulnerability. It was published on November 4, 2021 and has a CVSS 3.1 base score of 7.2 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.2, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

Technical description

MyBB before 1.8.29 allows Remote Code Injection by an admin with the "Can manage settings?" permission. The Admin CP's Settings management module does not validate setting types correctly on insertion and update, making it possible to add settings of supported type "php" with PHP code, executed on Change Settings pages.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

GitHubgithub.com/mybb/mybb/security/advisories/GHSA-8gxx-vmr9-h39pGitHubgithub.com/mybb/mybb/security/advisories/GHSA-8gxx-vmr9-h39p

How CyberStrike helps

Frequently asked questions

What is CVE-2021-43281?

CVE-2021-43281 is a high-severity vulnerability. It was published on November 4, 2021 and has a CVSS 3.1 base score of 7.2 (HIGH).

How severe is CVE-2021-43281?

This vulnerability has a CVSS 3.1 base score of 7.2, rated HIGH. It can be exploited remotely over the network. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2021-43281?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2021-43281?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2021-43281 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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