CVE-2019-12831 is a critical remote code execution vulnerability affecting MyBB versions prior to 1.8.21. Attackers can exploit a MySQL string truncation behavior during a crafted XML theme import to create a PHP shell in the forum's cache directory. This high-severity flaw (CVSS 7.2) allows for complete compromise of confidentiality, integrity, and availability with low attack complexity, requiring high privileges. There is currently no evidence of active exploitation, public exploit code, or significant community discussion surrounding this vulnerability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 1.8.21CPE matchmatch criteria | cpe:2.3:a:mybb:mybb:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.0
CVSS:3.0/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.1 Bluesky, 0.1 Mastodon, and 0.3 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Remediation records are not available for this CVE.