Detections
Analytics

CVE-2021-27890

high

Description

SQL Injection vulnerablity in MyBB before 1.8.26 via theme properties included in theme XML files.

References

https://github.com/mybb/mybb/security/advisories/GHSA-r34m-ccm8-mfhq

http://packetstormsecurity.com/files/161908/MyBB-1.8.25-Remote-Command-Execution.html

https://blog.sonarsource.com/mybb-remote-code-execution-chain

Details

Source: Mitre, NVD

Published: 2021-03-15

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 6.8

Vector: CVSS2#AV:N/AC:M/Au:N/C:P/I:P/A:P

Severity: Medium

CVSS v3

Base Score: 8.8

Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Severity: High

EPSS

EPSS: 0.05707