CVE-2019-12831
High
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.
SeverityHigh
CVSS7.2
Exploit probability—
Product
Mybb
PublishedJun 15, 2019
First seenJun 15, 2019
How to fix
Update
- mybb mybb1.8.21 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| mybb mybb | v < 1.8.21 | 1.8.21 |
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