CVE-2023-53979 MyBB 1.8.32 Authenticated Remote Code Execution via Chained Vulnerabilities
Authenticated administrators can bypass avatar upload restrictions to upload malicious files and execute arbitrary code on MyBB forums.
- Exploited in the wild
- Not known
- Login needed
- An administrator
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-53979?
CVE-2023-53979 is a high-severity vulnerability in Mybb Mybb, published on 22 Dec 2025. An attacker needs administrator access to exploit it, with no action from the victim.
Official description
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.
Weakness: CWE-22
Which versions are affected by CVE-2023-53979?
It affects 1 product.
Products include Mybb Mybb.
How do I fix CVE-2023-53979?
No fix has been published for CVE-2023-53979 yet. Limit exposure of the affected software until one is available.
Is CVE-2023-53979 being exploited?
There is no known exploitation of CVE-2023-53979 in the wild and no public exploit code.
Other vulnerabilities in Mybb Mybb
Sources
Also known as GHSA-5639-746g-v626.