CVE-2023-45150

Name: CVE-2023-45150
Creator: NVD / NIST
Published: 2023-10-16T20:15:15.393+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.39%

Last modified Jun 17, 2026

CVE-2023-45150 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. Nextcloud calendar is a calendar app for the Nextcloud server platform. Due to missing precondition checks the server was trying to validate strings of any length as email addresses even when megabytes of data were provided, eventually making the server busy and unresponsive. EPSS estimates a 0.39% chance of exploitation in the next 30 days.

Description

Nextcloud calendar is a calendar app for the Nextcloud server platform. Due to missing precondition checks the server was trying to validate strings of any length as email addresses even when megabytes of data were provided, eventually making the server busy and unresponsive. It is recommended that the Nextcloud Calendar app is upgraded to 4.4.4. The only workaround for users unable to upgrade is to disable the calendar app.

Metrics

CVSS 3.1

4.3/10

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

EPSS Probability

0.39%

30.5th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Nextcloud	Calendar	>= 1.0, < 4.4.4

References

https://github.com/nextcloud/calendar/pull/5358Patch
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-r936-8gwm-w452Vendor Advisory
https://hackerone.com/reports/2058337Exploit, Issue Tracking
https://github.com/nextcloud/calendar/pull/5358Patch
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-r936-8gwm-w452Vendor Advisory
https://hackerone.com/reports/2058337Exploit, Issue Tracking

Timeline

Published: Oct 16, 2023
Last Modified: Jun 17, 2026
Status: Modified

Frequently Asked Questions

What is CVE-2023-45150?

How severe is CVE-2023-45150?

CVE-2023-45150 has a CVSS score of 4.3/10 (MEDIUM severity). The EPSS model estimates a 0.39% probability of exploitation in the next 30 days.

How do I fix CVE-2023-45150?

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-2023-45150?

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

Scan your code now

Source: NVD / NIST