EUVD-2026-31362
GHSA-wmw3-3fv3-h54w
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/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
Lifecycle Timeline
1DescriptionNVD
Concrete CMS below 9.5.0 and below is vulnerable to password change without reauthorization and session-hardening bypass. The user-profile edit controller passes the entire raw POST array to UserInfo::update() without field whitelisting resulting in password change without requiring the current password and also resulting in registered users able to disable the per-user-IP-pinning in the session validator which is meant to detect hijacking. The Concrete CMS security team gave this vulnerability a CVSS v.4.0 score of 5.3 with vector CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N. Thanks 0x4c616e for reporting.
AnalysisAI
Concrete CMS versions below 9.5.0 expose authenticated users to two related privilege-abuse primitives via a mass assignment flaw: password replacement without the current password, and disabling per-user IP-pinning that guards against session hijacking. The user-profile edit controller forwards the entire raw POST body to UserInfo::update() with no field whitelist, allowing any registered user to inject arbitrary model attributes - including the password field and session-security settings - into their own profile update. …
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External POC / Exploit Code
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