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

Severity: low (CVSS 3.5 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: 2026-10-15 · updated 2026-10-15
Weakness: CWE-79

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.

Affected products

espocrm: before 9.3.9

References

https://github.com/espocrm/espocrm/commit/67223bfb82338c030f38dac03f12c73b7b3d760f
https://github.com/espocrm/espocrm/releases/tag/9.3.9
https://github.com/espocrm/espocrm/security/advisories/GHSA-x5p5-8mxj-9wv6

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