CVE-2019-12831
7.2 · HIGHOverview
CVE-2019-12831 is a high-severity vulnerability affecting mybb mybb. It was published on June 15, 2019 and has a CVSS 3.0 base score of 7.2 (HIGH).
This vulnerability has a CVSS 3.0 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
In MyBB before 1.8.21, an attacker can abuse a default behavior of MySQL on many systems (that leads to truncation of strings that are too long for a database column) to create a PHP shell in the cache directory of a targeted forum via a crafted XML import, as demonstrated by truncation of aaaaaaaaaaaaaaaaaaaaaaaaaa.php.css to aaaaaaaaaaaaaaaaaaaaaaaaaa.php with a 30-character limit, aka theme import stylesheet name RCE.
Remediation
Check the references section for vendor advisories and patches from mybb. Update mybb to the latest patched version. 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.
Affected Products
| Vendor | Product | Versions | Status |
|---|---|---|---|
| mybb | mybb | >= 0, < 1.8.21 | Affected |
Frequently Asked Questions
What is CVE-2019-12831?
CVE-2019-12831 is a high-severity vulnerability affecting mybb mybb. It was published on June 15, 2019 and has a CVSS 3.0 base score of 7.2 (HIGH).
How severe is CVE-2019-12831?
This vulnerability has a CVSS 3.0 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-2019-12831?
Check the references section for vendor advisories and patches from mybb. Update mybb to the latest patched version. 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-2019-12831?
CyberStrike's AI-powered security agents can automatically detect CVE-2019-12831 across your infrastructure using autonomous pentesting, DAST scanning, and HackBrowser. The platform continuously monitors for known vulnerabilities and provides actionable remediation guidance prioritized by real-world exploitability.
How CyberStrike Helps
AI agents map your attack surface to find vulnerabilities like this one.
Automated penetration testing that runs continuously, not just quarterly.
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Browser-based exploitation validates findings with real proof-of-concept.
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