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CVE-2021-43281

HIGHCVSS 7.2/10EPSS 1.29%

Last modified

CVE-2021-43281 is a high-severity vulnerability rated 7.2/10 on the CVSS scale. 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.. EPSS estimates a 1.29% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
7.2/10

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

EPSS Probability
1.29%

66.6th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

VendorProductVersions
MybbMybb>= 1.2.0, < 1.8.29

References

Timeline

Published
Last Modified
Status
Modified

Frequently Asked Questions

What is CVE-2021-43281?
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.
How severe is CVE-2021-43281?
CVE-2021-43281 has a CVSS score of 7.2/10 (HIGH severity). The EPSS model estimates a 1.29% probability of exploitation in the next 30 days.
How do I fix CVE-2021-43281?
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-2021-43281?

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

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Source: NVD / NIST