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Vulnerabilities

Vulnerability · CVE-2025-48940

MyBB is free and open source forum software.

Published Jun 2, 2025 · catalog updated Jun 2, 2025 · MyBB MyBB

Check if you run it

No confirmed exploitation is on record for CVE-2025-48940. EPSS is 0.54%. Act only if a listed version of MyBB MyBB is installed.

Gaps on this record

  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
High7.2
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.54%
Remediation
Version ranges on file
Affected products
vendor MyBB MyBB < 1.8.39

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 file present) and the upgrade script must be accessible (by re-installing the forum via access to ; when the forum has not yet been installed; or the attacker is authenticated as a forum administrator). MyBB 1.8.39 resolves this issue.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor MyBB MyBB < 1.8.39< 1.8.39

How to fix CVE-2025-48940

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2025-48940. EPSS is 0.54%. Act only if a listed version of MyBB MyBB is installed.

Which versions are affected?

Compare what you have installed with MyBB MyBB < 1.8.39 < 1.8.39. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.54%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 2, 2025 · EUVD

    Detected

    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 file present) and the upgrade script must be accessible (by re-installing the forum via acces

  2. Jun 2, 2025 · EUVD

    Updated

    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 file present) and the upgrade script must be accessible (by re-installing the forum via acces

Sources

  • CVE.orgVulnerability recordCVE-2025-48940

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2025-48940

    30-day exploitation probability 0.5%

    first.org
  • EUVDVulnerability recordEUVD-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 inst

    euvd.enisa.europa.eu

References

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.