Vulnerability in Pig-Mesh Pig
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.
Published · last modified .
CVSS v3 metric
CVSS v3 base score 9.1 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N.
EPSS exploit prediction
EPSS: 0.009 (58.9th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 59th percentile — 58.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.009 · newest: 0.009 · change: 0.000
Affected products
Weakness classification (CWE)
References
- github.com/geo-chen/oss/blob/main/pig.md (exploit, third-party-advisory)
- github.com/pig-mesh/pig/issues/1249 (issue-tracking)
- github.com/pig-mesh/pig/commit/ce958668f399110b97b3f1fcc5f517ff9bcfd535 (patch)
- github.com/pig-mesh/pig/blob/v4.0.0/pig-upms/pig-upms-biz/src/main/java/com/pig… (technical-description)
- github.com/pig-mesh/pig/blob/v4.0.0/pig-upms/pig-upms-biz/src/main/java/com/pig… (technical-description)
- github.com/pig-mesh/pig (product)
- www.vulncheck.com/advisories/pig-before-4.1.0-unverified-password-change-via-re… (third-party-advisory)
Frequently asked questions
- What is CVE-2026-91995?
- CVE-2026-91995 is a critical-severity vulnerability in Pig-Mesh Pig, classified under CWE-620. CVSS score: 9.1/10. Published 2026-09-15.
- How severe is CVE-2026-91995?
- Critical severity. CVSS v3 base score is 9.1 out of 10.