CVE-2019-12830

HighCVSS 8.7/10Last modified Jun 17, 2026

Description

In MyBB before 1.8.21, an attacker can exploit a parsing flaw in the Private Message / Post renderer that leads to [video] BBCode persistent XSS to take over any forum account, aka a nested video MyCode issue.

Metrics

CVSS 3.0 8.7/10CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N

Weakness enumeration

CWE-79

Affected software

Vendor	Product	Versions
n/a	n/a	n/a

References

https://blog.mybb.com/2019/06/10/mybb-1-8-21-released-security-maintenance-release/Release Notes, Third Party Advisory
https://blog.ripstech.com/2019/mybb-stored-xss-to-rce/Exploit, Vendor Advisory
https://blog.mybb.com/2019/06/10/mybb-1-8-21-released-security-maintenance-release/Release Notes, Third Party Advisory
https://blog.ripstech.com/2019/mybb-stored-xss-to-rce/Exploit, Vendor Advisory

Timeline

Published: Jun 15, 2019
Last modified: Jun 17, 2026
NVD status: Modified

Related CVEs from 2019

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