CVE-2019-12830
In MyBB before 1.8.21, an attacker can exploit a parsing flaw in the Private Message / Post...
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.
Attack profile
How easy it is to exploit
- Attack vector
- Network
- Complexity
- Low
- Privileges needed
- Low
- User interaction
- Required
What an attacker can affect
- Confidentiality
- High
- Integrity
- High
- Availability
- None
Exploit likelihood
What each source reports
NVD Score used
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.
- Record
CVE-2019-12830- CVSS 3.0
- 8.7 High
CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N - CVSS 2.0
- 3.5 Low
AV:N/AC:M/Au:S/C:N/I:P/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
CVE List No score
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.
- Record
CVE-2019-12830- Updated
- 2026-11-02
EUVDEUVD-2019-4410 No score
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.
- Record
EUVD-2019-4410- Updated
- 2026-11-03
GitHub AdvisoriesGHSA-h3wx-4w3j-grr9
In MyBB before 1.8.21, an attacker can exploit a parsing flaw in the Private Message / Post...
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.
- Record
GHSA-h3wx-4w3j-grr9- CVSS 3.0
- 8.7 High
CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N - Weakness
- CWE-79
- Updated
- 2026-11-02
Affected products
History
| Recorded | Changed | Sources |
|---|---|---|
| aliases | EUVD | |
| first indexed | CVE List, GitHub Advisories, NVD |
Dates are when Every CVE recorded each change. Upstream dates may differ.
In short
CVE-2019-12830 is a high vulnerability (CVSS 8.7) in Mybb, published June 15, 2019. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.96%, the 61st percentile. No source names a fixed version.