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CVE-2025-48940

MyBB's upgrade component vulnerable to local file inclusion

Published: Jun 2, 2025Updated: Jul 2, 2025 Sources: CVE List NVDCWE-22
NVD MITRE
7.2CVSSHIGH
EPSS Score
0.5%
Top 63.2%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

Description

MyBB is free and open source forum software. Prior to version 1.8.39, the upgrade component does not validate user input properly, which allows attackers to perform local file inclusion (LFI) via a specially crafted parameter value. In order to exploit the vulnerability, the installer must be unlocked (no `install/lock` file present) and the upgrade script must be accessible (by re-installing the forum via access to `install/index.php`; when the forum has not yet been installed; or the attacker is authenticated as a forum administrator). MyBB 1.8.39 resolves this issue.

CVSS Vector Breakdown

AV:NAC:LPR:HUI:NS:UC:HI:HA:H
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:HPrivileges Required
High
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:HAvailability
High
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Weaknesses

CWE-22

Affected Products

mybbmybbWeb & CMS Plugins
mybboss-projectWeb & CMS Pluginsaka mybb forums

Attack Graph

Products CVE Techniques Tactics

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Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Collection
Discovery
View detailed technique mapping

References

https://github.com/mybb/mybb/security/advisories/GHSA-q4jv-xwjx-37cp
github.com
https://github.com/mybb/mybb/commit/6e6cfbd524d9101b51e1278ecf520479b64b0f00
github.com
https://mybb.com/versions/1.8.39
mybb.com

Timeline

Published
Jun 2, 2025
Last Updated
Jul 2, 2025

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