CVE-2023-53878

Member Login Script 3.3 Client-Side Request Desynchronization Vulnerability

CVSS 6.9 MEDIUMEPSS 0.3%CWE-444

Vexday Risk Score

13Low

SSVC decision (CISA)

Track

No exploitation signal → monitor

CVSS 6.9EPSS 0.3%KEV nãoPoC —Nuclei —Metasploit —Patch —

Lifecycle

15 Dec 2025Published on NVD

Recommendation: Monitor — no exploitation signal at the moment.

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.

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N

Affected products

Phpjabbers · Member Login Script

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References

https://www.exploit-db.com/exploits/51710 https://www.phpjabbers.com/member-login-script/https://www.vulncheck.com/advisories/member-login-script-client-side-request-desynchronization-vulnerability