CVE-2021-27279

medium

Description

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

References

https://mybb.com/versions/1.8.25/

https://github.com/mybb/mybb/security/advisories/GHSA-6483-hcpp-p75w

https://github.com/mybb/mybb/commit/cb781b49116bf5c4d8deca3e17498122b701677a

Details

Source: Mitre, NVD

Published: 2021-02-22

Updated: 2026-06-17

Risk Information

CVSS v2

Base Score: 3.5

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

Severity: Low

CVSS v3

Base Score: 5.4

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

Severity: Medium

EPSS

EPSS: 0.00379