EspoCRM up to 9.3.8 applicationName cross site scripting

Summaryinfo

A vulnerability identified as problematic has been detected in EspoCRM up to 9.3.8. Impacted is an unknown function. This manipulation of the argument applicationName causes cross site scripting. This vulnerability is tracked as CVE-2026-53575. The attack is possible to be carried out remotely. No exploit exists. You should upgrade the affected component.

Detailsinfo

A vulnerability was found in EspoCRM up to 9.3.8. It has been declared as problematic. Affected by this vulnerability is some unknown functionality. The manipulation of the argument applicationName with an unknown input leads to a cross site scripting vulnerability. The CWE definition for the vulnerability is 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. As an impact it is known to affect integrity. The summary by CVE is:

EspoCRM is an open source customer relationship management application. Prior to 9.3.9, an authenticated administrator can place crafted content in the applicationName setting through CSP nonce injection. The persistent injection is inserted into the main application page without escaping, allowing attacker-controlled JavaScript to run in users' sessions and leak page data, including unsaved user input. This issue is fixed in version 9.3.9.

It is possible to read the advisory at github.com. This vulnerability is known as CVE-2026-53575 since 06/09/2026. The exploitation appears to be easy. The attack can be launched remotely. Additional levels of successful authentication are required for exploitation. It demands that the victim is doing some kind of user interaction. Technical details of the vulnerability are known, but there is no available exploit. The attack technique deployed by this issue is T1059.007 according to MITRE ATT&CK.

Upgrading to version 9.3.9 eliminates this vulnerability.

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Productinfo

Name

• EspoCRM

Version

• 9.3.0
• 9.3.1
• 9.3.2
• 9.3.3
• 9.3.4
• 9.3.5
• 9.3.6
• 9.3.7
• 9.3.8

License

• open-source

Website

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

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