CVE-2026-91995

CRITICAL 9.1

pig before 4.1.0 Unverified Password Change via /register/password

CVSS Score

9.1

EPSS Score

0.0%

EPSS Percentile

0th

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.

CWE	CWE-620
Vendor	pig-mesh
Product	pig
Published	Sep 15, 2026

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CVSS v3 Breakdown

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Attack Vector

Network

Attack Complexity

Low

Privileges Required

None

User Interaction

None

Scope

Unchanged

Confidentiality

High

Integrity

High

Availability

None

Affected Versions

pig-mesh / pig

0 < 4.1.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/geo-chen/oss/blob/main/pig.md github.com: https://github.com/pig-mesh/pig/issues/1249 github.com: https://github.com/pig-mesh/pig/commit/ce958668f399110b97b3f1fcc5f517ff9bcfd535 github.com: https://github.com/pig-mesh/pig/blob/v4.0.0/pig-upms/pig-upms-biz/src/main/java/com/pig4cloud/pig/admin/service/impl/SysUserServiceImpl.java#L650-L669 github.com: https://github.com/pig-mesh/pig/blob/v4.0.0/pig-upms/pig-upms-biz/src/main/java/com/pig4cloud/pig/admin/controller/SysRegisterController.java#L21-L53 github.com: https://github.com/pig-mesh/pig vulncheck.com: https://www.vulncheck.com/advisories/pig-before-4.1.0-unverified-password-change-via-register-password

Credits

🔍 George Chen