CVE-2021-32652: Missing permission check on email metadata retrieval

Severity: medium (CVSS 4.3 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.1% probability of exploitation in the next 30 days
Public exploit or detection template: yes
Published: 2021-06-01 · updated 2026-06-17
Weakness: CWE-284

Description

Nextcloud Mail is a mail app for the Nextcloud platform. A missing permission check in Nextcloud Mail before 1.4.3 and 1.8.2 allows another authenticated users to access mail metadata of other users. Versions 1.4.3 and 1.8.2 contain patches for this vulnerability; no workarounds other than the patches are known to exist.

Affected products

nextcloud Mail: before 1.4.3; from 1.5.5 before 1.8.2 — fixed in 1.4.3, 1.8.2

How to fix

Upgrade to a fixed version: nextcloud Mail 1.4.3, 1.8.2. Check the vendor advisory for mitigations.

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-mxx2-6rg9-v2vc
https://hackerone.com/reports/1094063
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-mxx2-6rg9-v2vc
https://hackerone.com/reports/1094063

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