CVE-2021-27946

HIGH

MyBB < 1.8.26 - SQL Injection via Poll Vote Count

Title source: llm
STIX 2.1

Exploitation Summary

EIP tracks 1 public exploit for CVE-2021-27946. PoCs published by SivertPL.

AI-analyzed exploit summary This exploit demonstrates a second-order semi-blind SQL injection in MyBB 1.8.25 via the 'votes[]' parameter in the 'Edit Poll' feature, triggered during a 'Move/Copy' operation. It leverages an unsigned integer covert channel to exfiltrate data such as database version or user password hashes.

Description

SQL Injection vulnerability in MyBB before 1.8.26 via poll vote count. (issue 1 of 3).

Exploits (1)

exploitdb WORKING POC
by SivertPL · textwebappsphp
https://www.exploit-db.com/exploits/49699

This exploit demonstrates a second-order semi-blind SQL injection in MyBB 1.8.25 via the 'votes[]' parameter in the 'Edit Poll' feature, triggered during a 'Move/Copy' operation. It leverages an unsigned integer covert channel to exfiltrate data such as database version or user password hashes.

Classification
Working Poc 95%
Attack Type
Sqli
Complexity
Complex
Reliability
Reliable
Target: MyBB 1.8.25
Auth required
Prerequisites: Permission to edit polls · Ability to perform 'Move/Copy' operations on threads
devstral-2 · analyzed Feb 16, 2026 Full analysis →

References (2)

Core 2
Core References
Patch, Release Notes, Third Party Advisory x_refsource_misc
https://github.com/mybb/mybb/security/advisories/GHSA-23m9-w75q-ph4p
Exploit, Third Party Advisory, VDB Entry x_refsource_misc
http://packetstormsecurity.com/files/161918/MyBB-1.8.25-SQL-Injection.html

Scores

CVSS v3 8.8
EPSS 0.0420
EPSS Percentile 89.7%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Details

CWE
CWE-89
Status published
Products (1)
mybb/mybb < 1.8.26
Published Mar 15, 2021
Tracked Since Feb 18, 2026