CVE-2025-48940

HIGH EPSS 37.1%
Published Jun 2, 20251y ago · Modified Jun 17, 20261w ago
7.2 CVSS 3.1
High
Find Similar
Published Jun 2, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

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 Details

Base Score
7.2
Exploitability
1.2
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity Low
Privileges Required High
User Interaction None
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
37.1% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-22 Path Traversal Resource Mgmt

Affected Products 1

VendorProductVersionRange
mybbmybb* <1.8.39

References 3

  • github.com https://github.com/mybb/mybb/commit/6e6cfbd524d9101b51e1278ecf520479b64b0f00
    Patch
  • github.com https://github.com/mybb/mybb/security/advisories/GHSA-q4jv-xwjx-37cp
    Vendor Advisory
  • mybb.com https://mybb.com/versions/1.8.39
    ProductRelease Notes

Remediation

  • github.com https://github.com/mybb/mybb/commit/6e6cfbd524d9101b51e1278ecf520479b64b0f00
    Patch