What is CVE-2023-30540?

CVE-2023-30540 is a low-severity vulnerability in Nextcloud Security-Advisories, classified under Information Disclosure. CVSS score: 3.5/10. Published 2023-04-17.

How severe is CVE-2023-30540?

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

Information disclosure in Nextcloud Security-Advisories

CVE-2023-30540

Nextcloud Talk is a chat, video & audio call extension for Nextcloud. In affected versions a user that was added later to a conversation can use this information to get access to data that was deleted before they were added to the conversation. This issue has been patched in version 15.0.5 and it is recommended that users upgrad to 15.0.5. There are no known workarounds for this issue.

Vulnerability class: Information Disclosure

Published 2023-04-17 · 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: 0.007 (49.4th percentile), scored 2026-09-29.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 49th percentile — 49.4% 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

Nextcloud Security-Advisories — versions >= 15.0.0, < 15.0.5
Nextcloud Talk

Weakness classification (CWE)

CWE-200 — Information Disclosure

References

github.com/nextcloud/security-advisories/security/advisories/GHSA-c9hr-cq65-9mjw (Vendor Advisory)
github.com/nextcloud/spreed/pull/8985 (Patch)
hackerone.com/reports/1894676 (Permissions Required)

Frequently asked questions

What is CVE-2023-30540?: CVE-2023-30540 is a low-severity vulnerability in Nextcloud Security-Advisories, classified under Information Disclosure. CVSS score: 3.5/10. Published 2023-04-17.
How severe is CVE-2023-30540?: Low severity. CVSS v3 base score is 3.5 out of 10.