CVE-2026-45285: Nextcloud is an open source content collaboration platform

Routine

MEDIUM 6.4UPGRADE

CVE-2026-45285 is a medium-severity flaw (CVSS 6.4) affecting nextcloud server. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Nextcloud is an open source content collaboration platform. From versions 32.0.0 to before 32.0.9, and 33.0.0 to before 33.0.3, when a user shares a folder or file with a Nextcloud Team that includes an external member (a person added via email address who does not have a Nextcloud account), the system automatically creates a public link for that external member. This public link is not displayed in the share section of the folder, so the folder

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	6.4 (Medium)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	Required
EPSS exploit chance	0.3% (top 78%)
CISA exploited list	No
Weakness	CWE-862
Published	2026-06-01
Last modified	2026-07-22

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

Last updated 2026-07-22 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-06-01 19:16 UTCPublished CVE record published
2026-07-22 08:10 UTCUpdated Record last modified

nextcloud nextcloud server UPGRADE

Affected: >= 32.0.0 and < 32.0.9 · >= 33.0.0 and < 33.0.3

Fixed in: 32.0.9, 33.0.3

Safe to downgrade to: a release before 32.0.0

1. Check installed version

apt-cache policy nextcloud-server || rpm -q nextcloud-server || nextcloud-server --version

2. UPGRADE to 32.0.9 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade nextcloud-server

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade nextcloud-server

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 32.0.0 (Debian / Ubuntu)

apt-cache madison nextcloud-server sudo apt install nextcloud-server=<VERSION_BEFORE_32.0.0> sudo apt-mark hold nextcloud-server

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

dnf --showduplicates list nextcloud-server sudo dnf downgrade nextcloud-server-<VERSION_BEFORE_32.0.0> sudo dnf versionlock add nextcloud-server

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-2026-45285?

nextcloud server: upgrade to 32.0.9, 33.0.3. Exact commands for each OS are on this page.

Is CVE-2026-45285 being exploited?

CVE-2026-45285 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-2026-45285 affect?

CVE-2026-45285 affects nextcloud server. Severity is medium (CVSS 6.4). Nextcloud is an open source content collaboration platform. From versions 32.0.0 to before 32.0.9, and 33.0.0 to before 33.0.3, when a user shares a folder or file with a Nextcloud Team that includes an external member (a person added via e

How urgent is CVE-2026-45285?

Priority 28/100. No elevated risk signals yet.

Software pages

Nextcloud vulnerabilities

Related CVEs

CVE-2026-45810 MEDIUM 6.8 UPGRADE Nextcloud is an open source content collaboration platform
CVE-2026-45690 MEDIUM 5.9 UPGRADE Nextcloud is an open source content collaboration platform
CVE-2026-45691 MEDIUM 5.9 UPGRADE Nextcloud is an open source content collaboration platform
CVE-2026-45281 HIGH 8.1 UPGRADE Nextcloud is an open source content collaboration platform
CVE-2026-45282 MEDIUM 6.5 UPGRADE Nextcloud is an open source content collaboration platform

References

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