CVE-2026-91995 (CVSS 9.1)

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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CVSS v3.1 Score

9.1

CRITICAL

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

EPSS — Exploit Prediction

0.0061

Probability of exploitation

0.48%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-620 CWE-620

References

Other References

https://github.com/geo-chen/oss/blob/main/pig.md https://github.com/pig-mesh/pig 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 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 https://github.com/pig-mesh/pig/commit/ce958668f399110b97b3f1fcc5f517ff9bcfd535 https://github.com/pig-mesh/pig/issues/1249 https://www.vulncheck.com/advisories/pig-before-4.1.0-unverified-password-change-via-register-password

Frequently Asked Questions

What is CVE-2026-91995? +

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. It has a CVSS v3.1 base score of 9.1 (CRITICAL).

How severe is CVE-2026-91995? +

CVE-2026-91995 has a CVSS v3.1 score of 9.1 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0061, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-91995? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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