CVE-2021-32652: Nextcloud Mail is a mail app for the Nextcloud platform

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HIGH 8.8UPGRADE

CVE-2021-32652 is a high-severity flaw (CVSS 8.8) affecting mail. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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.

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	8.8 (High)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	1.1% (top 34%)
CISA exploited list	No
Weakness	CWE-284, CWE-862
Published	2021-06-01
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: nextcloud

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2021-06-01 19:15 UTCPublished CVE record published
2026-06-17 03:53 UTCUpdated Record last modified

nextcloud mail UPGRADE

Affected: < 1.4.3 · >= 1.5.5 and < 1.8.2

Fixed in: 1.4.3, 1.8.2

Safe to downgrade to: a release before 1.5.5

1. Check installed version

apt-cache policy mail || rpm -q mail || mail --version

2. UPGRADE to 1.4.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade mail

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade mail

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

3. If no update is available yet, DOWNGRADE to a release before 1.5.5 (Debian / Ubuntu)

apt-cache madison mail sudo apt install mail=<VERSION_BEFORE_1.5.5> sudo apt-mark hold mail

3. If no update is available yet, DOWNGRADE (RHEL / Amazon Linux / Fedora)

dnf --showduplicates list mail sudo dnf downgrade mail-<VERSION_BEFORE_1.5.5> sudo dnf versionlock add mail

Downgrade risk

Downgrading can break dependent software and may reopen older bugs. Read the distro advisory first and test on a non-production host.

After downgrade

Restart the service, and keep the package held until a fixed release ships.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2021-32652?

mail: upgrade to 1.4.3, 1.8.2. Exact commands for each OS are on this page.

Is CVE-2021-32652 being exploited?

CVE-2021-32652 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2021-32652 affect?

CVE-2021-32652 affects mail. Severity is high (CVSS 8.8). 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

How urgent is CVE-2021-32652?

Priority 52/100. High severity; Public exploit reference

Software pages

Nextcloud vulnerabilities

Related CVEs

CVE-2025-66514 LOW 3.5 UPGRADE Nextcloud Mail is the mail app for Nextcloud, a self-hosted productivity platform
CVE-2024-52509 LOW 3.5 UPGRADE Nextcloud Mail is the mail app for Nextcloud, a self-hosted productivity platform
CVE-2024-52508 HIGH 8.2 UPGRADE Nextcloud Mail is the mail app for Nextcloud, a self-hosted productivity platform
CVE-2023-48307 LOW 3.5 UPGRADE Nextcloud Mail is the mail app for Nextcloud, a self-hosted productivity platform
CVE-2023-45660 MEDIUM 4.3 UPGRADE Nextcloud mail is an email app for the Nextcloud home server platform

References

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