CVE-2023-48307

Name: CVE-2023-48307
Creator: NVD / NIST
Published: 2023-11-21T23:15:07.807+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

CRITICALCVSS 9.8/10EPSS 0.87%

Last modified Jun 17, 2026

CVE-2023-48307 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. Nextcloud Mail is the mail app for Nextcloud, a self-hosted productivity platform. Starting in version 1.13.0 and prior to version 2.2.8 and 3.3.0, an attacker can use an unprotected endpoint in the Mail app to perform a SSRF attack. EPSS estimates a 0.87% chance of exploitation in the next 30 days.

Description

Nextcloud Mail is the mail app for Nextcloud, a self-hosted productivity platform. Starting in version 1.13.0 and prior to version 2.2.8 and 3.3.0, an attacker can use an unprotected endpoint in the Mail app to perform a SSRF attack. Nextcloud Mail app versions 2.2.8 and 3.3.0 contain a patch for this issue. As a workaround, disable the mail app.

Metrics

CVSS 3.1

9.8/10

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

EPSS Probability

0.87%

54.1th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

CWE-918

Affected Software

Vendor	Product	Versions
Nextcloud	Mail	>= 1.13.0, < 2.2.8
Nextcloud	Mail	>= 3.0.0, < 3.3.0

References

https://github.com/nextcloud/mail/pull/8709Issue Tracking, Patch
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-4pp4-m8ph-2999Vendor Advisory
https://hackerone.com/reports/1869714Permissions Required
https://github.com/nextcloud/mail/pull/8709Issue Tracking, Patch
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-4pp4-m8ph-2999Vendor Advisory
https://hackerone.com/reports/1869714Permissions Required

Timeline

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

Frequently Asked Questions

What is CVE-2023-48307?

How severe is CVE-2023-48307?

CVE-2023-48307 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.87% probability of exploitation in the next 30 days.

How do I fix CVE-2023-48307?

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-2023-48307?

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

Scan your code now

Source: NVD / NIST