Vulnerability Details : CVE-2019-12830
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.
Vulnerability category: Cross site scripting (XSS)
Products affected by CVE-2019-12830
- cpe:2.3:a:mybb:mybb:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2019-12830
0.07%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 27 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2019-12830
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
3.5
|
LOW | AV:N/AC:M/Au:S/C:N/I:P/A:N |
6.8
|
2.9
|
NIST | |
|
8.7
|
HIGH | CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N |
2.3
|
5.8
|
NIST |
CWE ids for CVE-2019-12830
-
The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users.Assigned by: nvd@nist.gov (Primary)
References for CVE-2019-12830
-
https://blog.ripstech.com/2019/mybb-stored-xss-to-rce/
MyBB <= 1.8.20: From Stored XSS to RCEExploit;Vendor Advisory
-
https://blog.mybb.com/2019/06/10/mybb-1-8-21-released-security-maintenance-release/
MyBB 1.8.21 Released — Security & Maintenance Release | MyBB BlogRelease Notes;Third Party Advisory
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