CVE-2026-91995 json
pig before 4.1.0 Unverified Password Change via /register/password
published 2026-09-15 54 d ago modified 2026-09-24 45 d ago also EUVD-2026-78435
- cvss
- 9.1
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.9%
- EPSS 0.9% chance of exploitation in 30 days, percentile 59%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
CISA SSVC
- Exploitation
- none
- Automatable
- yes
- Technical impact
- total
- Assessed
- 51 d ago
Exploit prediction
0.88% chance of exploitation in the next 30 days, higher than 59% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- github.com https://github.com/geo-chen/oss/blob/main/pig.md referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 4.0 | 9.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N |
| CNA | 3.1 | 9.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N |
| CNA | 4.0 | 9.3 | CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected products
- pig-mesh pig
Classification
- Weakness
-
- CWE-620 Unverified Password Change
References
-
github.com
/pig-mesh/pig/commit/ce958668f399110b97b3f1fcc5f517ff9bcfd535
patch
-
github.com
/geo-chen/oss/blob/main/pig.md
third-party-advisory, exploit
-
github.com
/pig-mesh/pig/issues/1249
issue-tracking
-
github.com
/pig-mesh/pig/blob/v4.0.0/pig-upms/pig-upms-biz/src/main/java/com/pig4cloud/pig/admin/service/impl/SysUserServ
technical-description
-
github.com
/pig-mesh/pig/blob/v4.0.0/pig-upms/pig-upms-biz/src/main/java/com/pig4cloud/pig/admin/controller/SysRegisterCo
technical-description
-
github.com
/pig-mesh/pig
product
-
vulncheck.com
/advisories/pig-before-4.1.0-unverified-password-change-via-register-password
third-party-advisory
Sources
- CVE List CVE-2026-91995
- NVD CVE-2026-91995
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.