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CVE-2026-33657

4.6
MEDIUMCVSS v3.1 Base Score
0.03%
LOW RiskEPSS (11th percentile)

EspoCRM is an open source customer relationship management application. Versions 9.3.3 and below have a stored HTML injection vulnerability that allows any authenticated user with standard (non-administrative) privileges to inject arbitrary HTML into system-generated email notifications by crafting malicious content in the post field of stream activity notes. The vulnerability exists because server-side Handlebars templates render the post field using unescaped triple-brace syntax, the Markdown processor preserves inline HTML by default, and the rendering pipeline explicitly skips sanitization for fields present in additionalData, creating a path where attacker-controlled HTML is accepted, stored, and rendered directly into emails without any escaping. Since the emails are sent using the system's configured SMTP identity (such as an administrative sender address), the injected content appears fully trusted to recipients, enabling phishing attacks, user tracking via embedded resources like image beacons, and UI manipulation within email content. The @mention feature further increases the impact by allowing targeted delivery of malicious emails to specific users. This issue has been fixed in version 9.3.4.

Published: 4/13/2026
Modified: 4/22/2026
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Vulnerability Summary

CVSS v3 Score

4.6MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:N

EPSS Score (Exploitation Probability)

0.03%LOW Exploitation Risk
11th percentile

This vulnerability has a 0.03% probability of being exploited in the next 30 days, ranking higher than 11% of all scored CVEs.

CWE Classification

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