// For flags

CVE-2021-27889

MyBB 1.8.25 - Chained Remote Command Execution

Severity Score

6.1
*CVSS v3.1

Exploit Likelihood

*EPSS

Affected Versions

*CPE

Public Exploits

3
*Multiple Sources

Exploited in Wild

-
*KEV

Decision

-
*SSVC
Descriptions

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

Una vulnerabilidad de tipo Cross-site Scripting (XSS) en MyBB versiones anteriores a 1.8.26 a través de Nested Auto URL cuando se analizan los mensajes

*Credits: N/A
CVSS Scores
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
Required
Scope
Changed
Confidentiality
Low
Integrity
Low
Availability
None
Attack Vector
Network
Attack Complexity
Medium
Authentication
None
Confidentiality
None
Integrity
Partial
Availability
None
* Common Vulnerability Scoring System
SSVC
  • Decision:-
Exploitation
-
Automatable
-
Tech. Impact
-
* Organization's Worst-case Scenario
Timeline
  • 2021-03-02 CVE Reserved
  • 2021-03-15 CVE Published
  • 2021-03-22 First Exploit
  • 2024-08-03 CVE Updated
  • 2024-09-22 EPSS Updated
  • ---------- Exploited in Wild
  • ---------- KEV Due Date
CWE
  • CWE-79: Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
CAPEC
Affected Vendors, Products, and Versions
Vendor Product Version Other Status
Vendor Product Version Other Status <-- --> Vendor Product Version Other Status
Mybb
Search vendor "Mybb"
 Mybb
Search vendor "Mybb" for product "Mybb"
 < 1.8.26
Search vendor "Mybb" for product "Mybb" and version " < 1.8.26"
-
Affected