Free and open · new CVEs checked every 20 minutesStatusRSSOpen dataContact

CVE-2026-45690: Nextcloud is an open source content collaboration platform

26
Routine
MEDIUM 5.9UPGRADE

CVE-2026-45690 is a medium-severity flaw (CVSS 5.9) 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. In Nextcloud Server from versions 32.0.0 to before 32.0.9, and 33.0.0 to before 33.0.3, an authentication bypass vulnerability allowed attackers with knowledge of a user's password to circumvent two-factor authentication (2FA) protections. When a user initiated login with valid credentials on a 2FA-enabled account, the system created a temporary session token before enforcing the second

Why this priority

  • No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score5.9 (Medium)
Attack vectorNetwork (remote)
Attack complexityHigh
Privileges neededLow
User interactionNone
EPSS exploit chance0.3% (top 79%)
CISA exploited listNo
WeaknessCWE-287
Published2026-06-01
Last modified2026-07-22
Publisher (CNA): GitHub, Inc. · Vendor: nextcloud

Share: LinkedIn · X · Reddit

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

Am I affected?

Timeline

nextcloud nextcloud server UPGRADE
Affected: >= 32.0.0 and < 32.0.9 · >= 33.0.0 and < 33.0.3 · >= 29.0.0 and < 29.0.16.16 · >= 30.0.0 and < 30.0.17.9 · >= 31.0.0 and < 31.0.14.5
Fixed in: 29.0.16.16, 30.0.17.9, 31.0.14.5, 32.0.9, 33.0.3
Safe to downgrade to: a release before 29.0.0
1. Check installed version
apt-cache policy nextcloud-server || rpm -q nextcloud-server || nextcloud-server --version
2. UPGRADE to 29.0.16.16 (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 29.0.0 (Debian / Ubuntu)
apt-cache madison nextcloud-server sudo apt install nextcloud-server=<VERSION_BEFORE_29.0.0> 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_29.0.0> 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-2026-45690?

nextcloud server: upgrade to 29.0.16.16, 30.0.17.9, 31.0.14.5, 32.0.9, 33.0.3. Exact commands for each OS are on this page.

Is CVE-2026-45690 being exploited?

CVE-2026-45690 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-2026-45690 affect?

CVE-2026-45690 affects nextcloud server. Severity is medium (CVSS 5.9). Nextcloud is an open source content collaboration platform. In Nextcloud Server from versions 32.0.0 to before 32.0.9, and 33.0.0 to before 33.0.3, an authentication bypass vulnerability allowed attackers with knowledge of a user's password

How urgent is CVE-2026-45690?

Priority 26/100. No elevated risk signals yet.

Software pages

Nextcloud vulnerabilities

Related CVEs

References

← Back to latest CVEs

Get the weekly exploited-CVE digest by emailThe CVEs being attacked this week and how to fix them. No spam, unsubscribe any time.