CVE-2021-27890 is a high-severity SQL Injection vulnerability affecting MyBB versions prior to 1.8.26, specifically through theme properties within theme XML files. With a CVSS score of 8.8 (High), this vulnerability allows an unauthenticated attacker to achieve high impact on confidentiality, integrity, and availability with low attack complexity, requiring user interaction. While not listed in CISA's KEV catalog, exploit code for a chained remote command execution is available on ExploitDB, and it has garnered some community discussion, indicating potential for exploitation.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 1.8.26CPE matchmatch criteria | cpe:2.3:a:mybb:mybb:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.2 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.1 Security Researcher mentions.