How severe is CVE-2021-32652?

CVE-2021-32652 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2021-32652 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2021-32652?

CVE-2021-32652 affects Nextcloud Mail. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2021-32652?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

When was CVE-2021-32652 published?

CVE-2021-32652 was published on 2021-06-01 and last updated on 2026-06-17.

CVE-2021-32652

CVE-2021-32652 is a high-severity vulnerability in Nextcloud Mail with a CVSS 3.x base score of 8.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-862.

Key facts

Severity: High (CVSS 3.x base score 8.8)
CVSS v2: 4.0
EPSS exploit prediction: 1% (65th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-862
Affected product: Nextcloud Mail
Published: 2021-06-01
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2021-32652?: 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.
How severe is CVE-2021-32652?: CVE-2021-32652 has a CVSS 3.x base score of 8.8, rated high severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2021-32652 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (65th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2021-32652?: CVE-2021-32652 affects Nextcloud Mail. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2021-32652?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
When was CVE-2021-32652 published?: CVE-2021-32652 was published on 2021-06-01 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nextcloud:mail:*:*:*:*:*:*:*:*

More vulnerabilities in Nextcloud Mail

CVE-2022-31132 — High (CVSS 8.3): Nextcloud Mail is an email application for the nextcloud personal cloud product. Affected versions shipped with a CSS…
CVE-2024-52508 — High (CVSS 8.2): Nextcloud Mail is the mail app for Nextcloud, a self-hosted productivity platform. When a user is trying to set up a…
CVE-2020-8156 — High (CVSS 7.0): A missing verification of the TLS host in Nextcloud Mail 1.1.3 allowed a man in the middle attack.
CVE-2023-23943 — Medium (CVSS 5.0): Nextcloud mail is an email app for the nextcloud home server platform. In affected versions the SMTP, IMAP and Sieve…
CVE-2023-45660 — Medium (CVSS 4.3): Nextcloud mail is an email app for the Nextcloud home server platform. In affected versions a missing check of origin,…
CVE-2021-32707 — Medium (CVSS 4.3): Nextcloud Mail is a mail app for Nextcloud. In versions prior to 1.9.6, the Nextcloud Mail application does not, by…

All CVEs affecting Nextcloud Mail →

Other CWE-862 (Missing Authorization) vulnerabilities

CVE-2026-101000 — Critical (CVSS 10.0): A vulnerability was determined in Netcore NBR100V2 1.3.240614.030928. This affects the function uci.apply of the file…
CVE-2026-97360 — Critical (CVSS 10.0): HFS2 version 2.4.0 and earlier contains an unauthenticated arbitrary file access vulnerability that allows…
CVE-2026-65381 — Critical (CVSS 10.0): A validation issue existed in the entitlement verification. This issue was addressed with improved validation of the…
CVE-2026-81648 — Critical (CVSS 10.0): The CryptoPayment Gateway WordPress plugin from 1.2.1 to 1.2.2 does not apply an authorization check on one of its AJAX…
CVE-2026-77770 — Critical (CVSS 10.0): The miniOrange 2FA WordPress plugin before 6.3.1, miniOrange 2FA WordPress plugin before 19.3 does not require a…
CVE-2026-65667 — Critical (CVSS 10.0): Missing authorization in Microsoft Teams allows an unauthorized attacker to elevate privileges over a network.

Browse all CWE-862 (Missing Authorization) vulnerabilities →