CVE-2021-27889 Information

Description

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

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Reference

https://github.com/mybb/mybb/security/advisories/GHSA-xhj7-3349-mqcm http://packetstormsecurity.com/files/161908/MyBB-1.8.25-Remote-Command-Execution.html https://blog.sonarsource.com/mybb-remote-code-execution-chain

Attack Complexity

LOW

Privileges Required

NONE

User Interaction Required

NONE

Scope

REQUIRED

Confidentiality Impact

CHANGED

Integrity Impact

LOW

Availability Impact

LOW

Base Score

NONE

Base Severity

6.1