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

CVE-2021-27279

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

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

MEDIUM · CVSS 5.4 EPSS 0.00379
Schedule remediation
  • Public exploit or PoC is available
Sigma rules0 YARA rules0
⬡

Weakness Classification

CWE-79Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
▤

Affected Products & Versions

1
mybb< 1.8.25
⚠

Public Exploits & PoCs

1
pocgithub.com · GHSA-6483-hcpp-p75wgithub.com
▣

Scoring & Timeline

5.4
MEDIUM · CVSS v3.1 · cve@mitre.org
View on NVD
Attack Vector
Network Adjacent Local Physical
Attack Complexity
Low High
Privileges Required
None Low High
User Interaction
None Required
Scope
Unchanged Changed
Confidentiality
None Low High
Integrity
None Low High
Availability
None Low High
Published to NVD22 Feb 2021 · 08:15 PM
CVSS VectorCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
🔗

References & Sources

2
Source URLs (vendor pages, mailing lists, write-ups). Exploit/PoC links are in their own section above to avoid duplication.
https://github.com/mybb/mybb/commit/cb781b49116bf5c4d8deca3e17498122b701677aPatchThird Party Advisory
https://mybb.com/versions/1.8.25/Release NotesVendor Advisory
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