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CVE-2026-102374— GestSup before 3.2.62 Stored XSS via Double-Decoded Email Subject in OAuth IMAP Connector

Quick assessment

Affected
GestSup GestSup
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.

GestSup 3.2.62 之前的版本在 IMAP OAuth 连接器中存在一个存储型跨站脚本（Stored Cross-Site Scripting, XSS）漏洞。该漏洞会在进行 HTML 转义后，对 MIME 编码的邮件主题进行双重解码。未授权的攻击者可以向被监控的邮箱发送构造的邮件，其中包含嵌套的 MIME 编码词，从而注入 JavaScript 代码。当技术人员在查看工单时，这些恶意脚本将在其会话中执行。

CVSS 6.1 · Medium
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I. Basic Information for CVE-2026-102374

Vulnerability Information
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Vulnerability Title
GestSup before 3.2.62 Stored XSS via Double-Decoded Email Subject in OAuth IMAP Connector
Source: CVE Program / CVE List V5
Vulnerability Description
GestSup versions before 3.2.62 contain a stored cross-site scripting vulnerability in the IMAP OAuth connector that double-decodes MIME-encoded email subjects after HTML escaping. Unauthenticated attackers can send crafted emails to monitored mailboxes with nested MIME encoded-words to inject JavaScript that executes in technician sessions when viewing tickets.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
GestSup GestSup 0 ~ 3.2.62 -

II. Public POCs for CVE-2026-102374

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III. Intelligence Information for CVE-2026-102374

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Vendor Pages for CVE-2026-102374 (2)

Other References for CVE-2026-102374 (2)

Same Patch Batch · GestSup · 2026-09-29 · 3 CVEs total

CVE-2026-102373 6.5 MEDIUM GestSup before 3.2.62 Private Ticket Comment Disclosure via threadedit Parameter
CVE-2026-102372 6.1 MEDIUM GestSup before 3.2.62 Stored XSS via Email Body in LOGIN IMAP Connector

IV. Related Vulnerabilities

Same product: GestSup
Same vendor: GestSup
Same weakness: CWE-79

V. Comments for CVE-2026-102374

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