What is CVE-2023-32318?

CVE-2023-32318 is a high-severity vulnerability in Nextcloud Server, classified under Insufficient Session Expiration. CVSS score: 7.2/10. Published 2023-05-26.

How severe is CVE-2023-32318?

High severity. CVSS v3 base score is 7.2 out of 10.

Vulnerability in Nextcloud Server

CVE-2023-32318

Nextcloud server provides a home for data. A regression in the session handling between Nextcloud Server and the Nextcloud Text app prevented a correct destruction of the session on logout if cookies were not cleared manually. After successfully authenticating with any other account the previous session would be continued and the attacker would be authenticated as the previously logged in user. It is recommended that the Nextcloud Server is upgraded to 25.0.6 or 26.0.1.

Published 2023-05-26 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 7.2 (High). Vector: CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:C/C:H/I:H/A:N.

EPSS exploit prediction

EPSS: 0.002 (10.0th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 10th percentile — 10.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000

Affected products

Nextcloud Server — versions 26.0.0
Nextcloud Security-Advisories — versions >= 25.0.2, < 25.0.6, >= 26.0.0, < 26.0.1

Weakness classification (CWE)

CWE-613 — Insufficient Session Expiration

References

github.com/nextcloud/security-advisories/security/advisories/GHSA-q8c4-chpj-6v38 (Vendor Advisory)
github.com/nextcloud/text/pull/3946 (Patch)

Frequently asked questions

What is CVE-2023-32318?: CVE-2023-32318 is a high-severity vulnerability in Nextcloud Server, classified under Insufficient Session Expiration. CVSS score: 7.2/10. Published 2023-05-26.
How severe is CVE-2023-32318?: High severity. CVSS v3 base score is 7.2 out of 10.