CVE-2026-91995
Received Received - Intake

Authentication Bypass in Pig Before 4.1.0 via Password Endpoint

Publication date: 2026-09-15

Last updated on: 2026-09-15

Assigner: VulnCheck

Description
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.

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Meta Information

Published
2026-09-15
Last Modified
2026-09-15
Generated
2026-09-15
AI Q&A
2026-09-15
EPSS Evaluated
N/A
NVD
CVE-2026-91995
EUVD
EUVD-2026-78435

Affected Vendors & Products

Showing 1 associated CPE
Vendor Product Version / Range
pig-mesh pig to 4.1.0 (exc)

Helpful Resources

Exploitability

CWE
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KEV
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CWE ID Description
CWE-620 When setting a new password for a user, the product does not require knowledge of the original password, or using another form of authentication.

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Executive Summary

CVE-2026-91995 is an authentication bypass vulnerability in pig software versions before 4.1.0. It exists in the /register/password endpoint where the system fails to verify the current password before allowing a change. Attackers can submit any username with an incorrect current password to overwrite account credentials, including the admin account, gaining full administrative control.

Detection Guidance

Check if your pig software version is before 4.1.0 by running: curl -s http://your-server/actuator/info | grep version. If vulnerable, inspect the /register/password endpoint for unauthenticated access and improper password validation.

Impact Analysis

This vulnerability allows remote attackers to gain full administrative control over the system by resetting any user's password, including the admin account, without valid credentials. This could lead to unauthorized access, data manipulation, privilege escalation, and complete system compromise.

Compliance Impact

This vulnerability likely violates compliance requirements for data protection and access control under standards like GDPR and HIPAA. It enables unauthorized access to sensitive data, compromises user authentication mechanisms, and fails to enforce proper password verification, leading to potential data breaches and regulatory penalties.

Mitigation Strategies

Upgrade pig to version 4.1.0 or later immediately. If upgrading is not possible, restrict access to the /register/password endpoint via firewall rules or disable user registration if not needed.

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