Path Traversal in Mybb
CVE-2023-53979
MyBB 1.8.32 contains a chained vulnerability that allows authenticated administrators to bypass avatar upload restrictions and execute arbitrary code. Attackers can modify upload path settings, upload a malicious PHP-embedded image file, and execute commands through the language configuration editing interface.
Vulnerability class: Path Traversal (Directory Traversal)
EPSS: 0.007 (50.0th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 8.8 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Mybb — versions 1.8.32, MyBB 1.8.32
Weakness classification (CWE)
References
- disclosure@vulncheck.com (Exploit, exploit)
- disclosure@vulncheck.com (Product, product)
- disclosure@vulncheck.com (Exploit, technical-description, Third Party Advisory)
- disclosure@vulncheck.com (Exploit, Third Party Advisory, third-party-advisory)
- af854a3a-2127-422b-91ae-364da2661108
Frequently asked questions
- What is CVE-2023-53979?
- CVE-2023-53979 is a high-severity vulnerability in Mybb, classified under Path Traversal. CVSS score: 8.8/10. Published 2025-12-22.
- How severe is CVE-2023-53979?
- High severity. CVSS v3 base score is 8.8 out of 10.