CVE-2021-27889

MEDIUM

MyBB <1.8.26 - XSS

Title source: llm

Description

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

Exploits (1)

exploitdb WORKING POC
javascriptwebappsphp
https://www.exploit-db.com/exploits/49696

References (3)

Scores

CVSS v3 6.1
EPSS 0.0091
EPSS Percentile 75.9%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Details

CWE
CWE-79
Status published
Products (1)
mybb/mybb < 1.8.26
Published Mar 15, 2021
Tracked Since Feb 18, 2026