CVE-2023-53878

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 v4.0

6.9 MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:L/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

EPSS

0.36% chance of exploitation in the next 30 days, 29th percentile

Published

2025-12-15

Updated

2026-05-12

Proof-of-concept exploits (1)

• https://www.exploit-db.com/exploits/51710

References

• CVE Record
• NVD entry

Related

• CVE-2023-53877
• CVE-2023-53879
• CVE-2023-53876
• CVE-2023-53880
• CVE-2023-53875
• CVE-2023-53881