CVE-2026-90934: EspoCRM before 10.0.4 Field-level Security Bypass via Attendees

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.3% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-09-14 · updated 2026-09-23
Weakness: CWE-863

Description

EspoCRM before 10.0.4 contains a field-level security bypass vulnerability in the meeting and call attendees endpoints that allows authenticated users to read restricted email addresses. Attackers can recover hidden attendee emails by exploiting incorrect ACL scope validation that checks parent event permissions instead of attendee entity permissions.

Affected products

espocrm: before 10.0.4 — fixed in 10.0.4

How to fix

Upgrade to a fixed version: espocrm 10.0.4. Check the vendor advisory for mitigations.

References

https://github.com/espocrm/espocrm/security/advisories/GHSA-hpgx-8qg3-5w7v
https://www.vulncheck.com/advisories/espocrm-before-10.0.4-field-level-security-bypass-via-attendees

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