CVE-2023-48304

Name: CVE-2023-48304
Creator: NVD / NIST
Published: 2023-11-21T22:15:08.087+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.60%

Last modified Jun 17, 2026

CVE-2023-48304 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prior to versions 25.0.11, 26.0.6, and 27.1.0 of Nextcloud Server and starting in version 22.0.0 and prior to versions 22.2.10.16, 23.0.12.11, 24.0.12.7, 25.0.11, 26.0.6, and 27.1.0 of Nextcloud Enterprise Server, an attacker could enable and disable the birthday calendar for any user on the same server. EPSS estimates a 0.60% chance of exploitation in the next 30 days.

Description

Nextcloud Server provides data storage for Nextcloud, an open source cloud platform. Starting in version 25.0.0 and prior to versions 25.0.11, 26.0.6, and 27.1.0 of Nextcloud Server and starting in version 22.0.0 and prior to versions 22.2.10.16, 23.0.12.11, 24.0.12.7, 25.0.11, 26.0.6, and 27.1.0 of Nextcloud Enterprise Server, an attacker could enable and disable the birthday calendar for any user on the same server. Nextcloud Server 25.0.11, 26.0.6, and 27.1.0 and Nextcloud Enterprise Server 22.2.10.16, 23.0.12.11, 24.0.12.7, 25.0.11, 26.0.6, and 27.1.0 contain patches for this issue. No known workarounds are available.

Metrics

CVSS 3.1

4.3/10

CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

EPSS Probability

0.60%

44.3th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-639

Affected Software

Vendor	Product	Versions
Nextcloud	Nextcloud Server	>= 22.0.0, <= 22.2.10.16
Nextcloud	Nextcloud Server	>= 23.0.0, < 23.0.12.11
Nextcloud	Nextcloud Server	>= 24.0.0, < 24.0.12.7
Nextcloud	Nextcloud Server	>= 25.0.0, < 25.0.11
Nextcloud	Nextcloud Server	>= 26.0.0, < 26.0.6
Nextcloud	Nextcloud Server	>= 27.0.0, < 27.1.0

References

https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8jwv-c8c8-9fr3Vendor Advisory
https://github.com/nextcloud/server/pull/40292Issue Tracking, Patch
https://hackerone.com/reports/2112973Exploit, Third Party Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8jwv-c8c8-9fr3Vendor Advisory
https://github.com/nextcloud/server/pull/40292Issue Tracking, Patch
https://hackerone.com/reports/2112973Exploit, Third Party Advisory

Timeline

Published: Nov 21, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-48304?

How severe is CVE-2023-48304?

CVE-2023-48304 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.60% probability of exploitation in the next 30 days.

How do I fix CVE-2023-48304?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2023-48304?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST