CVE-2021-27890
8.8 HighPublic exploit
SQL Injection vulnerablity in MyBB before 1.8.26 via theme properties included in theme XML files.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- None
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- High
Exploit likelihood
10.7%Up 7.9 points since Apr 14, 2021
What each source reports
NVD Score used
SQL Injection vulnerablity in MyBB before 1.8.26 via theme properties included in theme XML files.
- Record
CVE-2021-27890- CVSS 3.1
- 8.8 High
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H - CVSS 2.0
- 6.8 Medium
AV:N/AC:M/Au:N/C:P/I:P/A:P - Weakness
- CWE-89
- Updated
- 2026-11-02
CVE List No score
SQL Injection vulnerablity in MyBB before 1.8.26 via theme properties included in theme XML files.
- Record
CVE-2021-27890- Updated
- 2026-11-02
EUVDEUVD-2021-14627 No score
SQL Injection vulnerablity in MyBB before 1.8.26 via theme properties included in theme XML files.
- Record
EUVD-2021-14627- Updated
- 2026-11-03
Affected products
Public exploits
Links only. Every CVE stores no exploit code.
| Source | Link | Date |
|---|---|---|
| Exploit-DB | MyBB 1.8.25 - Chained Remote Command Execution | 2021-03-22 |
| PoC in GitHub | xiaopan233/Mybb-XSS_SQL_RCE-POC | 2021-03-25 |
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, Exploit-DB, NVD, PoC in GitHub |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2021-27890 is a high vulnerability (CVSS 8.8) in Mybb, published March 15, 2021. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 10.7%, the 95th percentile. No source names a fixed version.