MyBB's upgrade component vulnerable to local file inclusion
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| mybb | mybb | affected |
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No data.
| Vendor | Product | Versions |
|---|---|---|
| Mybb | Mybb | — |
| Source | ID | Title |
|---|---|---|
EUVD |
EUVD-2025-16668 | 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. |
No CVSS v4.0
No CVSS v3.0
No CVSS v2
This CVE is not in the KEV list.
Exploit prediction score: < 1% (0.564% probability within 30 days)
| Type | Values Removed | Values Added |
|---|---|---|
| First Time appeared |
Mybb
Mybb mybb |
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| CPEs | cpe:2.3:a:mybb:mybb:*:*:*:*:*:*:*:* | |
| Vendors & Products |
Mybb
Mybb mybb |
| Type | Values Removed | Values Added |
|---|---|---|
| Metrics |
ssvc
|
| Type | Values Removed | Values Added |
|---|---|---|
| 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. | |
| Title | MyBB's upgrade component vulnerable to local file inclusion | |
| Weaknesses | CWE-22 | |
| References |
| |
| Metrics |
cvssV3_1
|