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CVE-2026-31382— Gainsight Assist reflected XSS/HTML injection

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error_description参数处理不当，可能导致反射型跨站脚本攻击。

CVSS 6.1 · Medium EPSS 0.25% · P16

Possible ATT&CK Techniques 1 AI

T1189 · Drive-by Compromise
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I. Basic Information for CVE-2026-31382

Vulnerability Information
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Vulnerability Title
Gainsight Assist reflected XSS/HTML injection
Source: CVE Program / CVE List V5
Vulnerability Description
The error_description parameter is vulnerable to Reflected XSS. An attacker can bypass the domain's WAF using a Safari-specific onpagereveal payload.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:N/I:L/A:L
Source: CVE Program / CVE List V5
Vulnerability Type
在Web页面生成时对输入的转义处理不恰当(跨站脚本)
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error_description参数处理不当，可能导致反射型跨站脚本攻击。
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-2026-31382

# POC Description Source Link Shenlong Link
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III. Intelligence Information for CVE-2026-31382

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Vendor Advisories for CVE-2026-31382 (1)

Security Blog Posts for CVE-2026-31382 (1)

IV. Related Vulnerabilities

Same product: Gainsight Assist
Same vendor: Gainsight
Same weakness: CWE-79