CVE-2023-41362Public exploitNetwork attack vector

Authenticated PHP execution via PCRE type juggling

Published Aug 29, 2023 · Updated Oct 1, 2024

Code injection in MyBB before 1.8.36 allows remote authenticated users with Admin CP template privileges to execute arbitrary PHP code. The template validator uses loose comparisons on preg_match and preg_replace results, causing PCRE resource-limit errors to be treated as successful validation before template content reaches eval. Exploitation requires administrative permission to manage templates or themes and grants code execution in the web server process.

CVSS severity7.2
High
EPSS probability2.03%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Code injection in MyBB before 1.8.36 allows remote authenticated users with Admin CP template privileges to execute arbitrary PHP code. The template validator uses loose comparisons on preg_match and preg_replace results, causing PCRE resource-limit errors to be treated as successful validation before template content reaches eval. Exploitation requires administrative permission to manage templates or themes and grants code execution in the web server process.

The record

CVE
CVE-2023-41362
Published
Aug 29, 2023
Updated
Oct 1, 2024
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-94, T1059
Attack vector
network
Privileges
admin

Timeline

How it unfolded

  1. Aug 29, 2023CVE publishedPublication date reported by the CVE source.
  2. Oct 1, 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

7.2NVDCVSS: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 exploitPublished

Weakness, pattern, technique

CWE-94Improper Control of Generation of Code ('Code Injection')
T1059Command and Scripting Interpreter

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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