CVE-2023-45660

Name: CVE-2023-45660
Creator: NVD / NIST
Published: 2023-10-16T19:15:11.06+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.3/10EPSS 0.60%

Last modified Jun 17, 2026

CVE-2023-45660 is a medium-severity vulnerability rated 4.3/10 on the CVSS scale. Nextcloud mail is an email app for the Nextcloud home server platform. In affected versions a missing check of origin, target and cookies allows for an attacker to abuse the proxy endpoint to denial of service a third server. EPSS estimates a 0.60% chance of exploitation in the next 30 days.

Description

Nextcloud mail is an email app for the Nextcloud home server platform. In affected versions a missing check of origin, target and cookies allows for an attacker to abuse the proxy endpoint to denial of service a third server. It is recommended that the Nextcloud Mail is upgraded to 2.2.8 or 3.3.0. There are no known workarounds for this vulnerability.

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

0.60%

44.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-918

Affected Software

Vendor	Product	Versions
Nextcloud	Mail	>= 2.2.0, < 2.2.8
Nextcloud	Mail	>= 3.0.0, < 3.3.0

References

https://github.com/nextcloud/mail/pull/8459Issue Tracking, Patch
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8j9x-fmww-qr37Vendor Advisory
https://hackerone.com/reports/1895874Third Party Advisory
https://github.com/nextcloud/mail/pull/8459Issue Tracking, Patch
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8j9x-fmww-qr37Vendor Advisory
https://hackerone.com/reports/1895874Third Party Advisory

Timeline

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

Frequently Asked Questions

What is CVE-2023-45660?

How severe is CVE-2023-45660?

CVE-2023-45660 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-2023-45660?

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-2023-45660?

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

Scan your code now

Source: NVD / NIST