CVE-2023-45660

4.3 mediumEPSS 0.8%

Medium (4.3) in nextcloud mail. EPSS 0.8% chance of exploitation in the next 30 days.

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.

Severity

CVSS 3.1

4.3 medium

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

EPSS: 0.8% chance of exploitation in the next 30 days; higher than 55% of CVEs (scores of 2026-10-31)
CWE: CWE-918
Published: 2023-10-16
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19

Affected

nextcloud:mail

References

https://github.com/nextcloud/mail/pull/8459
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8j9x-fmww-qr37
https://hackerone.com/reports/1895874
https://github.com/nextcloud/mail/pull/8459
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-8j9x-fmww-qr37

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