PT-2021-17383 · Mybb · Mybb

Igor Sak-Sakovskiy · CVE-2021-27279 · Published 2021-02-22 · Updated 2024-03-06

Positive Technologies (AI Summary)

CVSS v3.1

5.4

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions MyBB versions prior to 1.8.25

Description The issue allows stored XSS via nested [email] tags with MyCode (aka BBCode).

Recommendations For versions prior to 1.8.25, update to version 1.8.25 or later to resolve the issue.

Exploit

Fix

XSS

Weakness Enumeration

CWE-79

Related Identifiers

BIT-MYBB-2021-27279

CVE-2021-27279

GHSA-6483-HCPP-P75W

Affected Products

Mybb

References · 10

• 🔥 https://github.com/mybb/mybb/security/advisories/GHSA-6483-hcpp-p75w · Exploit
• https://github.com/mybb/mybb/commit/cb781b49116bf5c4d8deca3e17498122b701677a · Patch
• https://mybb.com/versions/1.8.25 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-27279 · Security Note
• https://osv.dev/vulnerability/CVE-2021-27279 · Vendor Advisory
• https://osv.dev/vulnerability/BIT-mybb-2021-27279 · Vendor Advisory
• https://t.me/cvenotify/10304 · Telegram Post
• https://t.me/ptswarm/62 · Telegram Post
• https://t.me/cibsecurity/23945 · Telegram Post
• https://t.me/ptswarm/96 · Telegram Post