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
CVE-2023-48308
MEDIUMNVD 6.53.5▼
EchelonGraph scoreMEDIUM confidence
This low-severity CVE scores 3.5 under NVD CVSS v3. EPSS exploit probability: 0.3%, top 50% of all CVEs by exploit prediction. GitHub Security Advisory data not yet ingested — confidence will rise once GHSA publishes (typical lag: hours to days for open-source ecosystem CVEs; never for infrastructure-only CVEs).
Triggered by: NVD CVSS baseline
Sources: epss, nvd
6.5
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
- Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 1%CVSS: 6.5Exploit: NoneExposed: 0
No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.
- CVSS v3
- 6.5
- EG Score
- 3.5(medium)
- EPSS
- 42.0%
- KEV
- Not listed
Published
December 22, 2023
Last Modified
June 17, 2026
References (4)
- security-advisories@githubhttps://github.com/nextcloud/calendar/pull/5553
- security-advisories@githubhttps://github.com/nextcloud/security-advisories/security/advisories/GHSA-fv3c-qvjr-5rv8
- af854a3a-2127-422b-91ae-364da2661108https://github.com/nextcloud/calendar/pull/5553
- af854a3a-2127-422b-91ae-364da2661108https://github.com/nextcloud/security-advisories/security/advisories/GHSA-fv3c-qvjr-5rv8
Frequently asked(5)
What is CVE-2023-48308?
CVE-2023-48308 is a medium vulnerability published on December 22, 2023. 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
When was CVE-2023-48308 disclosed?
CVE-2023-48308 was first published in the National Vulnerability Database on December 22, 2023, with the most recent update on June 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2023-48308 actively exploited?
CVE-2023-48308 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 42.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2023-48308?
CVE-2023-48308 has a CVSS v3 base score of 6.5 (NVD). EchelonGraph synthesises NVD + CISA KEV + FIRST EPSS + GHSA into a combined EG score of 3.5.
How do I remediate CVE-2023-48308?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2023-48308, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2023-48308
Is Your Infrastructure Affected by CVE-2023-48308?
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