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CVE-2026-31381— Gainsight Assist plugin information disclosure

Quick assessment

Affected
Gainsight Gainsight Assist
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.

Gainsight Assist是Gainsight公司的一款客户沟通模板管理工具。 Gainsight Assist存在安全漏洞，该漏洞源于OAuth回调URL的state参数中暴露了base64编码的用户电子邮件地址，可能导致个人信息泄露。

CVSS 5.3 · Medium EPSS 0.31% · P24

Possible ATT&CK Techniques 1 AI

T1213 · Data from Information Repositories
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I. Basic Information for CVE-2026-31381

Vulnerability Information
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Vulnerability Title
Gainsight Assist plugin information disclosure
Source: CVE Program / CVE List V5
Vulnerability Description
An attacker can extract user email addresses (PII) exposed in base64 encoding via the state parameter in the OAuth callback URL.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N
Source: CVE Program / CVE List V5
Vulnerability Type
通过GET请求中的查询字符串导致的信息暴露
Source: CVE Program / CVE List V5
Vulnerability Title
Gainsight Assist 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Gainsight Assist是Gainsight公司的一款客户沟通模板管理工具。 Gainsight Assist存在安全漏洞，该漏洞源于OAuth回调URL的state参数中暴露了base64编码的用户电子邮件地址，可能导致个人信息泄露。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Gainsight Gainsight Assist - -

II. Public POCs for CVE-2026-31381

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III. Intelligence Information for CVE-2026-31381

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Vendor Advisories for CVE-2026-31381 (1)

Security Blog Posts for CVE-2026-31381 (1)

IV. Related Vulnerabilities

Same product: Gainsight Assist
Same vendor: Gainsight
Same weakness: CWE-598