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CVE-2026-55184— EspoCRM: Stored XSS in wysiwyg template fields if CSP is disabled

Quick assessment

Affected
espocrm espocrm
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.

EspoCRM 是一款开源的客户关系管理（CRM）应用程序。在 9.3.9 版本之前，拥有“邮件模板”或“PDF 模板”编辑权限的用户可以存储经过构造的 HTML 内容，从而绕过 moderateSanitizeHtml() 函数的安全检查。当其他用户以编辑模式打开该模板且配置项 clientCspDisabled 为 true 时，所存储的恶意代码将被执行，可能导致攻击者劫持该用户的会话。此问题已在 9.3.9 版本中得到修复。

CVSS 3.5 · Low EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 1

VendorProduct Version RangeStatus
espocrm espocrm < 9.3.9 affected
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I. Basic Information for CVE-2026-55184

Vulnerability Information
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Vulnerability Title
EspoCRM: Stored XSS in wysiwyg template fields if CSP is disabled
Source: CVE Program / CVE List V5
Vulnerability Description
EspoCRM is an open source customer relationship management application. Prior to 9.3.9, a user with Email Template or PDF Template edit permission can store crafted HTML that bypasses moderateSanitizeHtml(). When another user opens the template in edit mode and clientCspDisabled is true, the stored payload executes and can hijack the user's session. This issue is fixed in version 9.3.9.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/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
espocrm espocrm < 9.3.9 -

II. Public POCs for CVE-2026-55184

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III. Intelligence Information for CVE-2026-55184

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Vendor Advisories for CVE-2026-55184 (1)

Vendor Pages for CVE-2026-55184 (1)

Same Patch Batch · espocrm · 2026-10-15 · 12 CVEs total

CVE-2026-47168 9.1 CRITICAL EspoCRM: Authenticated RCE via Unsafe PHP Object Deserialization in MassAction/Export para
CVE-2026-53574 7.6 HIGH EspoCRM: Blind SQL injection via streamAttachments where-clause complex expression
CVE-2026-46691 6.5 MEDIUM EspoCRM: IDOR in Import exportErrors Endpoint Leaks CSV Data of Other Users
CVE-2026-46694 6.5 MEDIUM EspoCRM: Portal User ACL Bypass Exposes Internal Stream Notes
CVE-2026-77460 6.5 MEDIUM EspoCRM: Mass email template renderer leaks restricted record fields
CVE-2026-75505 6.0 MEDIUM EspoCRM: Access control bypass in Mass Update letting regular user with Mass Update permis
CVE-2026-63130 5.5 MEDIUM EspoCRM: Admin path traversal in LabelManager (Custom Label saving) allows arbitrary `.jso
CVE-2026-55154 5.4 MEDIUM EspoCRM: CSV/Formula Injection sanitizer bypass via leading whitespace/control characters
CVE-2026-46708 4.3 MEDIUM EspoCRM: Target list Opt-Out actions allows opting out record without access Target List a
CVE-2026-59994 4.3 MEDIUM EspoCRM: Pre-authentication stored HTML injection in stream notification emails about emai
CVE-2026-53575 2.7 LOW EspoCRM: Persistent XSS via CSP nonce injection in applicationName setting by admin user

IV. Related Vulnerabilities

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

V. Comments for CVE-2026-55184

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