Is CVE-2023-48307 actively exploited?

No active exploitation of CVE-2023-48307 has been confirmed so far. Continue monitoring, as exploit status can change.

Can CVE-2023-48307 be exploited remotely?

Yes. CVE-2023-48307 is exploitable remotely over the network (CVSS attack vector: Network).

What is the CVSS score of CVE-2023-48307?

CVE-2023-48307 has a CVSS score of 9.8 (CRITICAL).

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CRITICAL

CVE-2023-48307

CWE-918Published: November 21, 2023· Updated: Jun 17, 2026

9.8

CVSS v3.1

Official 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.

NVD Source

Risk Analysis

Nextcloud Mail contains an unprotected endpoint that allows an attacker to perform Server-Side Request Forgery (SSRF). This critical vulnerability could be leveraged to interact with internal network resources.

There is no public exploit known, and it is not in CISA KEV. The issue is remotely exploitable with low attack complexity.

Recommended Action

Upgrade to Nextcloud Mail version 2.2.8 or 3.3.0. If an immediate upgrade is not possible, disable the Mail app as a workaround.

Generated by the CTIWATCH analysis pipeline from this CVE's metadata (CVSS, EPSS, KEV status, exploit intelligence). Verify against vendor advisories before acting.

Technical Analysis

CVE-2023-48307 can be exploited remotely over the network without requiring physical or adjacent access, significantly expanding the attack surface for threat actors.

The vulnerability requires no privileges and no user interaction, making it a prime target for automated exploitation campaigns and worm-like propagation.

A successful exploit results in complete confidentiality breach (data exposure), full integrity compromise (data manipulation), availability disruption (denial of service), with a CVSS base score of 9.8.