CVE-2021-27279

MEDIUM 5.4CVE-2021-27279 · Published 22/02/2021 · updated 17/06/2026

In short

CVE-2021-27279 is a MEDIUM (CVSS 5.4) vulnerability affecting mybb (mybb).
Chance of exploitation in the next 30 days (EPSS): 0.96%, higher than 61.5% of all vulnerabilities.
Fix: update to 1.8.25 or later.

Package	Affected versions	Patched versions
mybb mybb	`< 1.8.25`	`1.8.25`

MyBB before 1.8.25 allows stored XSS via nested [email] tags with MyCode (aka BBCode).

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Package

Affected versions

Patched versions

< 1.8.25

1.8.25

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