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CVE-2026-91995— pig before 4.1.0 Unverified Password Change via /register/password

Quick assessment

Affected
pig-mesh pig
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Pig 在 4.1.0 之前的版本中，/register/password 端点存在认证绕过漏洞：该端点会丢弃密码验证结果，因此当前密码可接受任意值。远程攻击者可通过提交一个用户名并配以错误的当前密码，覆盖任意账户的凭据（包括管理员账户），从而获得完全的管理员控制权限。

CVSS 9.1 · Critical

Possible ATT&CK Techniques 1 AI

T1110 · Brute Force
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I. Basic Information for CVE-2026-91995

Vulnerability Information
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Vulnerability Title
pig before 4.1.0 Unverified Password Change via /register/password
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
未经验证的口令修改
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
pig-mesh pig 0 ~ 4.1.0 -

II. Public POCs for CVE-2026-91995

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III. Intelligence Information for CVE-2026-91995

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Patches & Fixes for CVE-2026-91995 (1)

Vendor Advisories for CVE-2026-91995 (1)

Proof of Concept for CVE-2026-91995 (1)

Vendor Pages for CVE-2026-91995 (1)

Other References for CVE-2026-91995 (1)

IV. Related Vulnerabilities

Same product: pig
Same vendor: pig-mesh
Same weakness: CWE-620

V. Comments for CVE-2026-91995

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