CVE-2021-27890

HIGH 8.8CVE-2021-27890 · Published 15/03/2021 · updated 17/06/2026

In short

CVE-2021-27890 is a HIGH (CVSS 8.8) vulnerability affecting mybb (mybb).
Chance of exploitation in the next 30 days (EPSS): 10.7%, higher than 95.8% of all vulnerabilities.
Fix: update to 1.8.26 or later.

Package	Affected versions	Patched versions
mybb mybb	`< 1.8.26`	`1.8.26`

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

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Package

Affected versions

Patched versions

< 1.8.26

1.8.26

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