Medium 6.9Published Dec 15, 2025

CVE-2023-53878Member Login Script 3.3 Client-Side Request Desynchronization Vulnerability

Updated under an hour ago (Oct 27, 2026, 9:23 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Every CVE for Phpjabbers Member Login Script

Exploited in the last 30 days

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: 6.9 MEDIUM (v4.0, CNA)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
Weakness (CWE): CWE-444
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: VulnCheck
NVD analysis: Deferred
Record last updated: May 12, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Phpjabbers Member Login Script phpjabbers:member_login_script (from the name)	3.3	CNA record

References

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-client-side-request-desynchronization-vulnerability	third-party-advisory

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.