CVE Vulnerability

CVE-2021-27889

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

4.3 /10

CVSS v2.0 :

V3 Legend

Vector :

Exploitability : 8.6 / Impact : 2.9

Attack Vector

Attack Complexity

Privileges Required

User Interaction

Confidentiality Impact NONE

Integrity Impact PARTIAL

Availability Impact NONE

Scope

6.1 /10

CVSS v3.0 : MEDIUM

V3 Legend

Vector :

Exploitability : 2.8 / Impact : 2.7

Attack Vector NETWORK

Attack Complexity LOW

Privileges Required NONE

User Interaction REQUIRED

Confidentiality Impact LOW

Integrity Impact LOW

Availability Impact NONE

Scope CHANGED

References
Link Resource
https://github.com/mybb/mybb/security/advisories/GHSA-xhj7-3349-mqcm Patch Third Party Advisory
http://packetstormsecurity.com/files/161908/MyBB-1.8.25-Remote-Command-Execution.html Exploit Third Party Advisory
https://blog.sonarsource.com/mybb-remote-code-execution-chain Exploit Third Party Advisory
Configurations

Configuration 1

cpe:2.3:a:mybb:mybb:*:*:*:*:*:*:*:*
Information

Published : 2021-03-15 05:15

Updated : 2021-09-21 05:48

NVD link : CVE-2021-27889

Mitre link : CVE-2021-27889

Products Affected
No products.
CWE
CWE-79