CVE-2021-27890

PoC —

CVSS 3.1

8.8 high

EPSS

11%p96

Published

Mar 15, 2021 (Mar 15, 2021)

Modified

Jun 17, 2026

Description

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

Vendors: mybb
Products: mybb
Weakness: CWE-89
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

NVD CVE.org GitHub PoCs EPSS (10.6%)

In the news1 stories

Critical RCE Flaw Reported in MyBB Forum Software—Patch Your Sites

The Hacker NewsMar 22, 06:29 UTC · Mar 22, 2021Vulnerability CVE-2021-27889 CVE-2021-27890 CVE-2021-27946+3 CVEs

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