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Vulnerability record · CVE-2023-48308 · published 22 December 2023

CVE-2023-48308: Nextcloud calendar vulnerability

Nextcloud · Calendar

Nextcloud/Cloud is a calendar app for Nextcloud. An attacker can gain access to stacktrace and internal paths of the server when generating an exception while editing a calendar appointment. It is recommended that the Nextcloud Calendar app is upgraded to 4.5.3

6.5 CVSS 3.1 Medium EPSS 0.55% · top 56.4% CWE-1258 · CWE-1258CWE-212 · CWE-212
6.5CVSS 3.1 base score
0.55%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
4References
17 Jun 2026Last modified by NVD

Description

Nextcloud/Cloud is a calendar app for Nextcloud. An attacker can gain access to stacktrace and internal paths of the server when generating an exception while editing a calendar appointment. It is recommended that the Nextcloud Calendar app is upgraded to 4.5.3

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/nextcloud/calendar/pull/5553 PatchVendor Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-fv3c-qvjr-5rv8 Vendor Advisory
https://github.com/nextcloud/calendar/pull/5553 PatchVendor Advisory
https://github.com/nextcloud/security-advisories/security/advisories/GHSA-fv3c-qvjr-5rv8 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

9.8CVE-2022-24838Nextcloud calendar injection vulnerabilityNextcloud Calendar is a calendar application for the nextcloud framework. SMTP Command Injection in Appointment Emails via Newlines: as newlines and …EPSS 33%6.5CVE-2025-66511Nextcloud calendar vulnerabilityNextcloud Calendar is a calendar app for Nextcloud. Prior to 6.0.3, the Calendar app generates participant tokens for meeting proposals using a hash …EPSS 0.30%5.7CVE-2025-66550Nextcloud calendar vulnerabilityNextcloud Calendar is a calendar app for Nextcloud. Prior to 4.7.17 and 5.2.4, when a malicious user creates a calendar event with a crafted attachme…EPSS 0.34%4.8CVE-2018-3763Nextcloud calendar cross-site scripting vulnerabilityIn Nextcloud Calendar before 1.5.8 and 1.6.1, a missing sanitization of search results for an autocomplete field could lead to a stored XSS requiring…EPSS 0.61%4.6CVE-2024-37316Nextcloud calendar vulnerabilityNextcloud Calendar is a calendar app for Nextcloud. Authenticated users could create an event with manipulated attachment data leading to a bad redir…EPSS 0.36%4.3CVE-2026-45286Nextcloud calendar information exposure vulnerabilityNextcloud is an open source content collaboration platform. From versions 5.5.13 to before 5.5.17, and 6.2.0 to before 6.2.3, an authenticated user c…EPSS 0.46%4.3CVE-2023-45150Nextcloud calendar uncontrolled resource consumption vulnerabilityNextcloud calendar is a calendar app for the Nextcloud server platform. Due to missing precondition checks the server was trying to validate strings …EPSS 0.39%4.3CVE-2023-33183Nextcloud calendar improper authorization vulnerabilityCalendar app for Nextcloud easily sync events from various devices with your Nextcloud. Some internal paths of the website are disclosed when the SMT…EPSS 0.44%

Source: NIST National Vulnerability Database (record CVE-2023-48308), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.