CVE-2026-91995: pig before 4.1.0 Unverified Password Change via /register/password
pig before 4.1.0 contains an authentication bypass vulnerability in the /register/password endpoint where password verification results are discarded, allowing any value as the current password. Remote attackers can submit a username with an incorrect current password to overwrite any account credential including the admin account and gain full administrative control.
Affected Software
Event History
Frequently Asked Questions
Which deployments are affected?
Pig versions before 4.1.0 are affected. The vulnerable endpoint is /register/password.
What does an attacker need to exploit this issue?
An attacker can exploit it remotely by submitting a username and an incorrect current password to the password-change endpoint. No valid current password is required.
What is the practical impact of successful exploitation?
An attacker can overwrite credentials for any account, including an administrator account. This can result in full administrative control.
What should be prioritized for remediation?
Upgrade Pig to version 4.1.0 or later, since versions before 4.1.0 are affected. Prioritize systems where the /register/password endpoint is reachable remotely.