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CVE-2021-27890

HighPublished

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

Published: Mar 15, 2021
Updated: Aug 3, 2024
Assigning CNA: mitre
Evidence observed: Mar 22, 2021

Primary CVSS

8.8/ 10High

nvd · CVSS 3.1

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

EPSS probability estimate

10.6%

Moderate · next 30 days

Percentile: 95.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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

Sources

Mybb-XSS_SQL_RCE-POCPoC
Mybb associate CVE-2021-27890 & CVE-2021-27889 to RCE poc
MyBB 1.8.25 - Chained Remote Command ExecutionExploit
SivertPL · php · Mar 22, 2021

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