CVE-2025-48940

HIGH

7.2

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.

CVE Details

CVSS v3.1 Score7.2

SeverityHIGH

CVSS VectorCVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H

Attack VectorNETWORK

ComplexityLOW

Privileges RequiredHIGH

User InteractionNONE

Published6/2/2025

Last Modified7/2/2025

Sourcenvd

Honeypot Sightings0

Affected Products

mybb:mybb

Weaknesses (CWE)

CWE-22

References

https://github.com/mybb/mybb/commit/6e6cfbd524d9101b51e1278ecf520479b64b0f00(security-advisories@github.com)

https://github.com/mybb/mybb/security/advisories/GHSA-q4jv-xwjx-37cp(security-advisories@github.com)

https://mybb.com/versions/1.8.39(security-advisories@github.com)

IOC Correlations

No correlations recorded

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