Vulnerability CVE-2021-27889
Published: 2021-03-15

Description:
Cross-site Scripting (XSS) vulnerability in MyBB before 1.8.26 via Nested Auto URL when parsing messages.

Type:

CWE-79

 (Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting'))

CVSS2 => (AV:N/AC:M/Au:N/C:N/I:P/A:N)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.3/10
2.9/10
8.6/10
Exploit range
Attack complexity
Authentication
Remote
Medium
No required
Confidentiality impact
Integrity impact
Availability impact
None
Partial
None
Affected software
MYBB -> MYBB 

 References:
http://packetstormsecurity.com/files/161908/MyBB-1.8.25-Remote-Command-Execution.html
https://github.com/mybb/mybb/security/advisories/GHSA-xhj7-3349-mqcm
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