What is CVE-2021-35948?

CVE-2021-35948 is a medium-severity vulnerability in ownCloud, classified under Session Fixation. CVSS score: 5.4/10. Published 2021-09-07.

How severe is CVE-2021-35948?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Vulnerability in ownCloud

CVE-2021-35948

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.

Published 2021-09-07 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.007 (51.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 51st percentile — 51.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.007 · newest: 0.007 · change: 0.000

Affected products

ownCloud

Weakness classification (CWE)

CWE-384 — Session Fixation

References

doc.owncloud.com/server/admin_manual/release_notes.html (Release Notes, Vendor Advisory)
owncloud.com/security-advisories/cve-2021-35948/ (Vendor Advisory)

Frequently asked questions

What is CVE-2021-35948?: CVE-2021-35948 is a medium-severity vulnerability in ownCloud, classified under Session Fixation. CVSS score: 5.4/10. Published 2021-09-07.
How severe is CVE-2021-35948?: Medium severity. CVSS v3 base score is 5.4 out of 10.