{"id":"CVE-2023-53878","aliases":["EUVD-2025-203431","GHSA-3855-8298-m4gc"],"status":"published","title":"Member Login Script 3.3 Client-Side Request Desynchronization Vulnerability","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.","severity":{"version":"4.0","score":6.9,"vector":"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","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00367,"percentile":0.30884,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":false},"cwes":["CWE-444"],"published":"2025-12-15T20:28:18Z","modified":"2026-06-17T06:46:14Z","products":[{"vendor":"phpjabbers","product":"member login script"}],"references":[{"url":"https://www.exploit-db.com/exploits/51710","tags":["exploit"]},{"url":"https://www.phpjabbers.com/member-login-script/","tags":["product"]},{"url":"https://www.vulncheck.com/advisories/member-login-script-client-side-request-desynchronization-vulnerability","tags":["third-party-advisory"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2023-53878"},{"url":"https://www.phpjabbers.com/member-login-script"},{"url":"https://github.com/advisories/GHSA-3855-8298-m4gc"}],"sources":{"cve":[{"id":"CVE-2023-53878","title":"Member Login Script 3.3 Client-Side Request Desynchronization Vulnerability","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.","status":"published","published":"2025-12-15T20:28:18.174Z","modified":"2026-05-12T20:46:29.791Z","cvss":[{"version":"4.0","score":6.9,"vector":"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","level":"medium","assessor":"cna"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T14:35:31.264455Z"}],"euvd":[{"id":"EUVD-2025-203431","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.","status":"published","published":"2025-12-15T20:28:18Z","modified":"2026-05-12T20:46:29Z","cvss":[{"version":"4.0","score":6.9,"vector":"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","level":"medium"}],"updated_at":"2026-11-02T19:04:36.64757Z"}],"ghsa":[{"id":"GHSA-3855-8298-m4gc","title":"Member Login Script 3.3 contains a client-side desynchronization vulnerability that allows...","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.","status":"published","published":"2025-12-15T21:30:32Z","modified":"2025-12-15T21:30:45Z","cvss":[{"version":"4.0","score":6.9,"vector":"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/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","level":"medium"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T15:05:12.969095Z"}],"nvd":[{"id":"CVE-2023-53878","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.","status":"published","published":"2025-12-15T21:15:50.563Z","modified":"2026-06-17T06:46:14.527Z","cvss":[{"version":"4.0","score":6.9,"vector":"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/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","level":"medium","assessor":"secondary"}],"cwes":["CWE-444"],"updated_at":"2026-11-02T14:09:26.50087Z"}]}}