Executive Summary



This Alert is flagged as TOP 25 Common Weakness Enumeration from CWE/SANS. For more information, you can read this.
Informations
Name CVE-2021-27279 First vendor Publication 2021-02-22
Vendor Cve Last vendor Modification 2024-11-21

Security-Database Scoring CVSS v3

Cvss vector : CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Overall CVSS Score 5.4
Base Score 5.4 Environmental Score 5.4
impact SubScore 2.7 Temporal Score 5.4
Exploitabality Sub Score 2.3
 
Attack Vector Network Attack Complexity Low
Privileges Required Low User Interaction Required
Scope Changed Confidentiality Impact Low
Integrity Impact Low Availability Impact None
Calculate full CVSS 3.0 Vectors scores

Security-Database Scoring CVSS v2

Cvss vector : (AV:N/AC:M/Au:S/C:N/I:P/A:N)
Cvss Base Score 3.5 Attack Range Network
Cvss Impact Score 2.9 Attack Complexity Medium
Cvss Expoit Score 6.8 Authentication Requires single instance
Calculate full CVSS 2.0 Vectors scores

Detail

MyBB before 1.8.25 allows stored XSS via nested [email] tags with MyCode (aka BBCode).

Original Source

Url : http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-27279

CWE : Common Weakness Enumeration

% Id Name
100 % CWE-79 Failure to Preserve Web Page Structure ('Cross-site Scripting') (CWE/SANS Top 25)

CPE : Common Platform Enumeration

TypeDescriptionCount
Application 92

Sources (Detail)

https://github.com/mybb/mybb/commit/cb781b49116bf5c4d8deca3e17498122b701677a
https://github.com/mybb/mybb/security/advisories/GHSA-6483-hcpp-p75w
https://mybb.com/versions/1.8.25/
Source Url

Alert History

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Date Informations
2025-07-01 01:43:20
  • Multiple Updates
2024-11-28 13:54:36
  • Multiple Updates
2021-09-08 01:43:27
  • Multiple Updates
2021-05-04 14:09:22
  • Multiple Updates
2021-04-22 03:12:31
  • Multiple Updates
2021-03-26 12:38:30
  • Multiple Updates
2021-02-23 09:23:00
  • Multiple Updates
2021-02-23 00:22:54
  • First insertion