CVE-2021-27279

PoC —

CVSS 3.1

5.4 medium

EPSS

<1%p60

Published

Feb 22, 2021 (Feb 22, 2021)

Modified

Jun 17, 2026

Description

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

Vendors: mybb
Products: mybb
Weakness: CWE-79
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

NVD CVE.org GitHub PoCs EPSS (1.0%)

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