CVE-2026-109675: Frappe Suite before commit 2697564 Broken Access Control in Mail Mailbox and Quota APIs

Severity: medium (CVSS 4.3 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: 2026-10-12 · updated 2026-10-18
Weakness: CWE-639

Description

Frappe Suite before commit 2697564a9c46da6acc614743eaf9915fe5238f4f contains a broken access control vulnerability in the get_mailboxes and get_quota APIs that allows authenticated mail users to access other users' data. Attackers can supply another user's JMAP account ID to read mailbox names, message counts, automation rules with sender addresses, and storage quota usage.

References

https://github.com/frappe/suite/security/advisories/GHSA-4gv8-m97c-4jmv
https://www.vulncheck.com/advisories/frappe-suite-before-commit-2697564-broken-access-control-in-mail-mailbox-and-quota-apis

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