Client-Side Desynchronization Vulnerability in Member Login Script by PHPJabbers
CVE-2023-53878

7.3HIGH

Key Information:

Vendor

PHPjabbers

Status
Member Login Script
Vendor
CVE Published:
15 December 2025

Badges

👾 Exploit Exists🟡 Public PoC

What is CVE-2023-53878?

The Member Login Script version 3.3 presents a client-side desynchronization vulnerability, where attackers can exploit the parsing of the Content-Length header. By crafting specific POST requests that include smuggled secondary requests, malicious actors can potentially bypass the standard server-side request processing controls, leading to unauthorized access and manipulation of system behaviors.

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Affected Version(s)

Member Login Script 3.3

Exploit Proof of Concept (PoC)

PoC code is written by security researchers to demonstrate the vulnerability can be exploited. PoC code is also a key component for weaponization which could lead to ransomware.

CVE-2023-53878 - Proof of Concept

References

https://www.exploit-db.com/exploits/51710
exploit
https://www.phpjabbers.com/member-login-script/
product
https://www.vulncheck.com/advisories/member-login-script-...
third-party-advisory

CVSS V4

Score:
7.3
Severity:
HIGH
Confidentiality:
Low
Integrity:
Low
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • 🟡

    Public PoC available

  • 👾

    Exploit known to exist

  • Vulnerability published

  • Vulnerability Reserved

Credit

nu11secur1ty
JSON
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