SQL Injection Vulnerability in MyBB by MyBB Group
CVE-2021-27890

8.8HIGH

Key Information:

Vendor

Mybb

Status
Mybb
Vendor
CVE Published:
15 March 2021

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2021-27890?

An SQL Injection vulnerability exists in MyBB versions prior to 1.8.26 that allows attackers to manipulate theme properties through malicious XML files. By exploiting this flaw, a remote attacker could execute arbitrary SQL queries, potentially leading to unauthorized access and data breaches. Website administrators are urged to upgrade to the latest version to mitigate this security risk.

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Deploy the Patch

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

Mybb-XSS_SQL_RCE-POC
Created by xiaopan233

References

https://github.com/mybb/mybb/security/advisories/GHSA-r34...
x_refsource_MISC
http://packetstormsecurity.com/files/161908/MyBB-1.8.25-R...
x_refsource_MISC
https://blog.sonarsource.com/mybb-remote-code-execution-c...
x_refsource_MISC

EPSS Score

5% chance of being exploited in the next 30 days.

CVSS V3.1

Score:
8.8
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
Required
Scope:
Unchanged

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

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