How severe is CVE-2023-48307?

CVE-2023-48307 has a CVSS 3.x base score of 3.5, rated low severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity none, and availability low.

Is CVE-2023-48307 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-48307?

CVE-2023-48307 affects Nextcloud Mail. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-48307?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

When was CVE-2023-48307 published?

CVE-2023-48307 was published on 2023-11-21 and last updated on 2026-06-17.

CVE-2023-48307

CVE-2023-48307 is a low-severity vulnerability in Nextcloud Mail with a CVSS 3.x base score of 3.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-918.

Key facts

Severity: Low (CVSS 3.x base score 3.5)
EPSS exploit prediction: 1% (54th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-918
Affected product: Nextcloud Mail
Published: 2023-11-21
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2023-48307?: 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.
How severe is CVE-2023-48307?: CVE-2023-48307 has a CVSS 3.x base score of 3.5, rated low severity. It is exploitable over network with low attack complexity, requires low privileges and user interaction. Impact on confidentiality is none, integrity none, and availability low.
Is CVE-2023-48307 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (54th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-48307?: CVE-2023-48307 affects Nextcloud Mail. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-48307?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
When was CVE-2023-48307 published?: CVE-2023-48307 was published on 2023-11-21 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:nextcloud:mail:*:*:*:*:*:*:*:*

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