CVE-2023-53878 Member Login Script 3.3 Client-Side Request Desynchronization Vulnerability
Attackers can exploit HTTP request desynchronization in Member Login Script to bypass server-side request processing controls via crafted POST requests.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2023-53878?
CVE-2023-53878 is a medium-severity vulnerability in Phpjabbers Member Login Script, published on 15 Dec 2025. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Member Login Script 3.3 contains a client-side desynchronization vulnerability that allows attackers to manipulate HTTP request handling by exploiting Content-Length header parsing. Attackers can send crafted POST requests with smuggled secondary requests to potentially bypass server-side request processing controls.
Weakness: CWE-444
Which versions are affected by CVE-2023-53878?
How do I fix CVE-2023-53878?
No fix has been published for CVE-2023-53878 yet. Limit exposure of the affected software until one is available.
Is CVE-2023-53878 being exploited?
There is no known exploitation of CVE-2023-53878 in the wild and no public exploit code.
Sources
Also known as GHSA-3855-8298-m4gc.