EspoCRM up to 9.3.3 SVG File cross site scripting

Summaryinfo

A vulnerability classified as problematic has been found in EspoCRM up to 9.3.3. Affected by this vulnerability is an unknown functionality of the component SVG File Handler. The manipulation leads to cross site scripting. This vulnerability is uniquely identified as CVE-2026-33741. The attack is possible to be carried out remotely. No exploit exists. It is recommended to upgrade the affected component.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in EspoCRM up to 9.3.3. This issue affects some unknown processing of the component SVG File Handler. The manipulation with an unknown input leads to a cross site scripting vulnerability. Using CWE to declare the problem leads to CWE-79. The product does not neutralize or incorrectly neutralizes user-controllable input before it is placed in output that is used as a web page that is served to other users. Impacted is integrity. The summary by CVE is:

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.

It is possible to read the advisory at github.com. The identification of this vulnerability is CVE-2026-33741 since 03/23/2026. The exploitation is known to be easy. The attack may be initiated remotely. It demands that the victim is doing some kind of user interaction. The technical details are unknown and an exploit is not publicly available. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 9.3.4 eliminates this vulnerability.

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Productinfo

Name

• EspoCRM

Version

• 9.3.0
• 9.3.1
• 9.3.2
• 9.3.3

License

• open-source

Website

• Product: https://github.com/espocrm/espocrm/

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