What is CVE-2023-28845?

CVE-2023-28845 is a low-severity vulnerability in Nextcloud Security-Advisories, classified under Improper Access Control. CVSS score: 3.5/10. Published 2023-03-31.

How severe is CVE-2023-28845?

Low severity. CVSS v3 base score is 3.5 out of 10.

Vulnerability in Nextcloud Security-Advisories

CVE-2023-28845

Nextcloud talk is a video & audio conferencing app for Nextcloud. In affected versions the talk app does not properly filter access to a conversations member list. As a result an attacker could use this vulnerability to gain information about the members of a Talk conversation, even if they themselves are not members. It is recommended that the Nextcloud Talk is upgraded to 14.0.9 or 15.0.4. There are no known workarounds for this vulnerability.

Published 2023-03-31 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 3.5 (Low). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:N/A:N.

EPSS exploit prediction

EPSS: 0.004 (36.2th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 36th percentile — 36.2% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.004 · newest: 0.004 · change: 0.000

Affected products

Nextcloud Security-Advisories — versions >= 15.0.0, < 15.0.4, >= 14.0.0, < 14.0.9
Nextcloud Talk

Weakness classification (CWE)

CWE-284 — Improper Access Control

References

github.com/nextcloud/security-advisories/security/advisories/GHSA-3m6r-479j-4chf (Vendor Advisory)
github.com/nextcloud/spreed/pull/8651 (Patch)

Frequently asked questions

What is CVE-2023-28845?: CVE-2023-28845 is a low-severity vulnerability in Nextcloud Security-Advisories, classified under Improper Access Control. CVSS score: 3.5/10. Published 2023-03-31.
How severe is CVE-2023-28845?: Low severity. CVSS v3 base score is 3.5 out of 10.