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CVE-2026-33741: EspoCRM: Stored XSS via SVG attachment loading same-origin JavaScript

• Severity: medium (CVSS 6.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-19 · updated 2026-07-24
• Weakness: CWE-79

Description

EspoCRM is an open source customer relationship management application. Versions 9.3.3 and below allow authenticated users to upload SVG attachments through normal attachment-capable fields and later serve those SVG files as top-level inline documents through both the attachment and image entry points, resulting in stored cross-user XSS reachable through a normal attachment workflow. Although inline SVG script is blocked by the response CSP, the same CSP still allows same-origin external script. As a result, an attacker can upload a malicious SVG together with a second attacker-controlled JavaScript attachment, then trick another user into opening the SVG to execute JavaScript in the victim's EspoCRM origin. This issue has been fixed in version 9.3.4.

Affected products

• espocrm: before 9.3.4

References

• https://github.com/espocrm/espocrm/security/advisories/GHSA-5wh5-ccv2-m3pv
• https://github.com/espocrm/espocrm/security/advisories/GHSA-5wh5-ccv2-m3pv

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