CVE-2021-27948Network attack vector

Database query manipulation via unvalidated group IDs

Published Mar 15, 2021 · Updated Aug 3, 2024

SQL injection in MyBB before 1.8.26 allows remote authenticated users to execute SQL through crafted Additional User Groups IDs. The Admin Control Panel joins submitted Additional User Groups values into a comma-separated field without coercing each entry to an integer, and later code incorporates the stored values into SQL queries without escaping. High-privileged Admin Control Panel access is required, and injected statements run with the forum database account's permissions.

CVSS severity7.2
High
EPSS probability0.90%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

SQL injection in MyBB before 1.8.26 allows remote authenticated users to execute SQL through crafted Additional User Groups IDs. The Admin Control Panel joins submitted Additional User Groups values into a comma-separated field without coercing each entry to an integer, and later code incorporates the stored values into SQL queries without escaping. High-privileged Admin Control Panel access is required, and injected statements run with the forum database account's permissions.

The record

CVE
CVE-2021-27948
Published
Mar 15, 2021
Updated
Aug 3, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-89
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Mar 15, 2021CVE publishedPublication date reported by the CVE source.
  2. Aug 3, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesadmin

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.2MyBBCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-89Improper Neutralization of Special Elements used in an SQL Command ('SQL Injection')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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