CVE-2021-35948: Session fixation on password protected public links in the ownCloud Server before 10.8.0 allows an attacker to

Q: How do I fix CVE-2021-35948?

owncloud: upgrade to 10.8.0. Exact commands for each OS are on this page.

Q: Is CVE-2021-35948 being exploited?

CVE-2021-35948 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2021-35948 affect?

CVE-2021-35948 affects owncloud. Severity is medium (CVSS 5.4). Session fixation on password protected public links in the ownCloud Server before 10.8.0 allows an attacker to bypass the password protection when they can force a target client to use a controlled cookie.

Q: How urgent is CVE-2021-35948?

Priority 32/100. No elevated risk signals yet.

Routine

MEDIUM 5.4UPGRADE

CVE-2021-35948 is a medium-severity flaw (CVSS 5.4) affecting owncloud. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Session fixation on password protected public links in the ownCloud Server before 10.8.0 allows an attacker to bypass the password protection when they can force a target client to use a controlled cookie.

Why this priority

No elevated risk signals yet

A fixed release or distro patch exists.

Risk facts

CVSS score	5.4 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.7% (top 47%)
CISA exploited list	No
Weakness	CWE-384
Published	2021-09-07
Last modified	2026-06-17

Publisher (CNA): MITRE · Vendor: owncloud

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

Am I affected?

Timeline

2021-09-07 20:15 UTCPublished CVE record published
2026-06-17 03:57 UTCUpdated Record last modified

owncloud owncloud UPGRADE

Affected: < 10.8.0

Fixed in: 10.8.0

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 10.8.0 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade owncloud

Note

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

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-2021-35948?

owncloud: upgrade to 10.8.0. Exact commands for each OS are on this page.

Is CVE-2021-35948 being exploited?

CVE-2021-35948 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-2021-35948 affect?

CVE-2021-35948 affects owncloud. Severity is medium (CVSS 5.4). Session fixation on password protected public links in the ownCloud Server before 10.8.0 allows an attacker to bypass the password protection when they can force a target client to use a controlled cookie.

How urgent is CVE-2021-35948?

Priority 32/100. No elevated risk signals yet.

Software pages

ownCloud vulnerabilities

Related CVEs

CVE-2022-43679 MEDIUM 4.2 UPGRADE The Docker image of ownCloud Server through 10.11 contains a misconfiguration that renders the trusted_domains
CVE-2022-31649 HIGH 7.5 UPGRADE ownCloud owncloud/core before 10.10.0 Improperly Removes Sensitive Information Before Storage or Transfer.
CVE-2021-35949 MEDIUM 5.3 UPGRADE The shareinfo controller in the ownCloud Server before 10.8.0 allows an attacker to bypass the permission chec
CVE-2021-35947 MEDIUM 5.3 UPGRADE The public share controller in the ownCloud server before version 10.8.0 allows a remote attacker to see the i
CVE-2021-35946 CRITICAL 9.8 UPGRADE A receiver of a federated share with access to the database with ownCloud version before 10.8 could update the

References

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