AUGUST 4, 2026
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Case File

CVE-2021-27889

MEDIUM · CVSS 6.1 EPSS 5.07% Public Exploit

Source: NVD + CISA KEV + EPSS (historical backfill) · Published 2021-03-15 · Last synced 2026-08-04

CyberRota Analysis

This is a medium severity vulnerability with a CVSS score of 6.1. Public exploit code or proof-of-concept references have been detected in its references.

Public Exploit Signal

A public exploit, PoC, GitHub repository or Metasploit reference was detected for this CVE.

GitHub PoC Links
External Security References

Note: these links are listed for security research and verification purposes only.

CVE
CVE-2021-27889
Severity
MEDIUM
CVSS
6.1
EPSS
5.07%

Original NVD Description

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

Related CVEs

Other vulnerabilities affecting the same vendor(s)